Relevant bibliographies by topics / QCM sensors

Academic literature on the topic 'QCM sensors'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "QCM sensors"

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Miyake, Akiko, Satoshi Komasa, Yoshiya Hashimoto, Yutaka Komasa, and Joji Okazaki. "Adsorption of Saliva Related Protein on Denture Materials: An X-Ray Photoelectron Spectroscopy and Quartz Crystal Microbalance Study." Advances in Materials Science and Engineering 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/5478326.

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The aim of this study was to evaluate the difference in the adsorption behavior of different types of bovine salivary proteins on the PMMA and Ti QCM sensors are fabricated by spin-coating and sputtering onto bare QCM sensors by using QCM and X-ray photoelectron spectroscopy (XPS). SPM, XPS, and contact angle investigations were carried out to determine the chemical composition and surface wettability of the QCM surface. We discuss the quality of each sensor and evaluate the potential of the high-frequency QCM sensors by investigating the binding between the QCM sensor and the proteins albumin and mucin (a salivary-related protein). The SPM image showed a relatively homogeneous surface with nano-order roughness. The XPS survey spectra of the thin films coated on the sensors were similar to the binding energy of the characteristic spectra of PMMA and Ti. Additionally, the amount of salivary-related protein on the PMMA QCM sensor was higher than those on the Ti and Au QCM sensors. The difference of protein adsorption is proposed to be related to the wettability of each material. The PMMA and Ti QCM sensors are useful tools to study the adsorption and desorption of albumin and mucin on denture surfaces.
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Regmi, Bishnu P., Puspa L. Adhikari, and Beni B. Dangi. "Ionic Liquid-Based Quartz Crystal Microbalance Sensors for Organic Vapors: A Tutorial Review." Chemosensors 9, no. 8 (July 27, 2021): 194. http://dx.doi.org/10.3390/chemosensors9080194.

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Organic vapor sensors are used in diverse applications ranging from environmental monitoring to biomedical diagnostics. Among a number of these sensors, quartz crystal microbalance (QCM) sensors prepared by coating ionic liquids (ILs) or their composites are promising devices for the analysis of volatile organic compounds (VOCs) in complex chemical mixtures. Ionic liquids are remarkable materials, which exhibit tunable physico-chemical properties, chemical and thermal stability, multiple interactions with diverse group of molecules, and enormous structural variability. Moreover, ILs exhibit viscoelastic properties, and hence these materials are ideal for creation of QCM virtual sensor arrays. While the scientific literature on IL-coated QCM sensors is rapidly growing, there is still much to learn. This manuscript provides a comprehensive review on the development of IL-coated QCM sensors and multi-sensor arrays as well as their applications for the analysis of VOCs in complex mixtures. Furthermore, IL-coated QCM virtual sensor arrays and their applications are presented. A short overview of some of the QCM designs, future research areas, and recommendations are also discussed. This short review is a necessary first step towards standardization and further development of QCM for the analysis of VOCs.
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Varga, Marián, Alexandr Laposa, Pavel Kulha, Marina Davydova, Jiri Kroutil, Miroslav Husak, and Alexander Kromka. "Fabrication of Diamond Based Quartz Crystal Microbalance Gas Sensor." Key Engineering Materials 605 (April 2014): 589–92. http://dx.doi.org/10.4028/www.scientific.net/kem.605.589.

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Synthetic diamond has remarkable properties comparable with natural diamond and hence is a very promising material for many various applications (sensors, heat sink, optical mirrors, cold cathode, tissue engineering, etc.). Nowadays, deposition of diamond films is normally employed in chemical vapor deposition (CVD) usually at high temperatures (800900 °C), what limit its application to high melting substrates. Gravimetric (mass) sensors belong to the major categories of chemical sensors and the most common type of mass sensor is the bulk acoustic quartz crystal microbalance (QCM). This contribution deals with a nanocrystalline diamond (NCD) growth from the H2/CH4/CO2gas mixture at low temperature (400 °C) by pulsed linear antenna microwave plasma system on 10 MHz circular AT-cut quartz resonators substrate. Gas sensor based on the NCD-coated QCM was developed for detection of ammonia (NH3) at room temperature. Measurements not only confirmed the functionality of this first published NCD-coated QCM sensor, but in addition its sensitivity was twofold to a virgin QCM sensor with a gold active layer.
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Julian, Trisna, Aditya Rianjanu, Shidiq Nur Hidayat, Ahmad Kusumaatmaja, Roto Roto, and Kuwat Triyana. "Quartz crystal microbalance coated with PEDOT–PSS/PVA nanofiber for a high-performance humidity sensor." Journal of Sensors and Sensor Systems 8, no. 2 (July 16, 2019): 243–50. http://dx.doi.org/10.5194/jsss-8-243-2019.

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Abstract. Quartz crystal microbalance (QCM) coated with poly(3,4-ethylenedioxythiophene) and polystyrene sulfonate mixed with polyvinyl alcohol (PEDOT–PSS/PVA) nanofiber has been fabricated as a humidity sensor using the electrospinning method. Three types of PEDOT–PSS/PVA nanofiber sensors are fabricated with different needle-to-collector electrospinning distances. The scanning electron microscope images confirm the presence of beads in the nanofiber structure. The results show that the sensor mass deposition increased with the decrease in needle-to-collector distance. The best sensor performance is exhibited by the sample with medium needle-to-collector distance (QCM NF 2). The QCM NF 2 nanofiber sensor shows excellent sensitivity of up to 33.56 Hz per percentage point of relative humidity, with rapid response (5.6 s) and recovery (3.5 s) times, good linearity, excellent repeatability, low hysteresis, and long-term stability and response. The QCM PEDOT–PSS/PVA nanofiber sensor provides a simple method to fabricate high-performance humidity sensors.
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Cao, Yu, Zhong Cao, Jiao Yun Xia, Ju Lan Zeng, and Li Xian Sun. "Calixarene Molecules Immobilized on Gold Substrates of QCM Sensors Based on Self-Assembled Monolayer Technology." Advanced Materials Research 239-242 (May 2011): 2054–57. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.2054.

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Four calixarene supramolecular compounds, RCT, PCT, MRCT, and TBCA as active materials, were immobilized on gold substrates of quartz crystal microbalance (QCM) sensors by using L-cysteine self-assembled monolayer (SAM) as a linker. The RCT immobilized QCM sensor possessed the best response characteristics for methanol molecule when the assembling concentration of RCT reached 1.0 mg/mL. The frequency shift response value of the RCT immobilized QCM sensor was in direct proportion to the concentration of methanol vapor with a range of 0 ~ 6000 ppm. Comparing with a gas chromatography, the proposed QCM sensor could be well used for the determination of methanol vapor with a recovery rate of 98.01 ~ 103.9 %, and the two methods showed a well consistent examination result. Also, the sensor possessed good reproducibility and stability, showing that the RCT immobilized QCM sensor can be applied for the detection of the methanol vapor of atmospheric polutants in our living environment.
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Kuchmenko and Lvova. "A Perspective on Recent Advances in Piezoelectric Chemical Sensors for Environmental Monitoring and Foodstuffs Analysis." Chemosensors 7, no. 3 (August 26, 2019): 39. http://dx.doi.org/10.3390/chemosensors7030039.

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This paper provides a selection of the last two decades publications on the development and application of chemical sensors based on piezoelectric quartz resonators for a wide range of analytical tasks. Most of the attention is devoted to an analysis of gas and liquid media and to industrial processes controls utilizing single quartz crystal microbalance (QCM) sensors, bulk acoustic wave (BAW) sensors, and their arrays in e-nose systems. The unique opportunity to estimate several heavy metals in natural and wastewater samples from the output of a QCM sensor array highly sensitive to changes in metal ion activity in water vapor is shown. The high potential of QCM multisensor systems for fast and cost-effective water contamination assessments “in situ” without sample pretreatment is demonstrated.
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Rodríguez-Torres, Marcos, Víctor Altuzar, Claudia Mendoza-Barrera, Georgina Beltrán-Pérez, Juan Castillo-Mixcóatl, and Severino Muñoz-Aguirre. "Discrimination Improvement of a Gas Sensors’ Array Using High-Frequency Quartz Crystal Microbalance Coated with Polymeric Films." Sensors 20, no. 23 (December 6, 2020): 6972. http://dx.doi.org/10.3390/s20236972.

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The discrimination improvement of an array of four highly sensitive 30 MHz gas quartz crystal microbalance (QCM) sensors was performed and compared to a similar system based on a 12-MHz QCM. The sensing polymeric films were ethyl cellulose (EC), poly-methyl methacrylate (PMMA), Apiezon L (ApL), and Apiezon T (ApT) and they were coated over the AT-cut QCM devices by the drop casting technique. All the sensors had almost the same film thickness (0.2 μm). The fabricated QCM sensor arrays were exposed to three different concentrations, corresponding to 5, 10, and 15 μL, of ethanol, ethyl acetate, and heptane vapors. The steady state sensor responses were measured in a static system at a temperature of 20 °C and relative humidity of 22%. Our results showed that the 30-MHz sensors have a higher sensitivity than 12-MHz ones (around 5.73 times), independently of the sensing film and measured sample. On the other hand, principal component analysis and discriminant analysis were performed using the raw data of the responses. An improvement of the classification percentage between 12 MHz and 30 MHz sensors was found. However, it was not sufficient, especially for low concentrations. Furthermore, using partition coefficient and discriminant analysis (DA), an improvement of 100% classification of the three samples was achieved for the case of the 30-MHz sensor array.
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Ummah, Auliya Rahmatul, Imam Tazi, and Muthmainnah Muthmainnah. "QCM SENSOR SENSITIVITY ANALYSIS OF SILVER ELECTRODES COATED WITH LIPID MEMBRANE OLEYL ALCOHOL TOWARD NaCl AND HCl." Jurnal Neutrino 11, no. 2 (September 17, 2019): 65. http://dx.doi.org/10.18860/neu.v11i2.6597.

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<p>One of the sensors, which is currently being developed is the QCM sensor. The QCM sensor is a sensor that utilizes the frequency change to detect a change in mass due to a test substance. The use of a QCM sensor includes other forms of electronic tongue sensor that can distinguish five basic flavours on the tongue. QCM sensor can also be varied electrodes using various lipid membranes such as electronic tongues to increase sensor sensitivity. This research aims to determine the sensitivity of the QCM sensor before and after coated with the lipid membrane to NaCl and HCl. The sensitivity of the QCM sensor to NaCl is 1.47 Hz/M for uncoated sensor and 0.63 Hz/M for coated sensor, while the sensitivity of HCl is 4.55 Hz/M for uncoated sensor and 4.93 Hz/M for coated sensor. The difference of the results is caused by the nature of ionization of the compound and the amount of concentration used. The result of the sensitivity research shows that the QCM sensor with Oleyl Alcohol lipid membrane is more sensitive to HCl than NaCl.</p>
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Kusakawa, You, Eiji Yoshida, and Tohru Hayakawa. "Protein Adsorption to Titanium and Zirconia Using a Quartz Crystal Microbalance Method." BioMed Research International 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/1521593.

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Protein adsorption onto titanium (Ti) or zirconia (ZrO2) was evaluated using a 27 MHz quartz crystal microbalance (QCM). As proteins, fibronectin (Fn), a cell adhesive protein, and albumin (Alb), a cell adhesion-inhibiting protein, were evaluated. The Ti and ZrO2 sensors for QCM were characterized by atomic force microscopy and electron probe microanalysis observation, measurement of contact angle against water, and surface roughness. The amounts of Fn and Alb adsorbed onto the Ti and ZrO2 sensors and apparent reaction rate were obtained using QCM measurements. Ti sensor showed greater adsorption of Fn and Alb than the ZrO2 sensor. In addition, amount of Fn adsorbed onto the Ti or ZrO2 sensors was higher than that of Alb. The surface roughness and hydrophilicity of Ti or ZrO2 may influence the adsorption of Fn or Alb. With regard to the adsorption rate, Alb adsorbed more rapidly than Fn onto Ti. Comparing Ti and ZrO2, Alb adsorption rate to Ti was faster than that to ZrO2. Fn adsorption will be effective for cell activities, but Alb adsorption will not. QCM method could simulate in vivo Fn and Alb adsorption to Ti or ZrO2.
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Hu, Jing Ling, Ting Zhou, Yun Fei Zhang, Zhe Wang, Dong Mei Luo, and Zhong Cao. "Detection of Trace Formaldehyde Gas Based on Quartz Crystal Microbalance Sensor in Living Environment." Advanced Materials Research 233-235 (May 2011): 720–23. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.720.

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Using four types of calixarene derivatives (RCT, PCT, MRCT, TBCA) as coating materials, quartz crystal microbalance (QCM) sensors have been examined for detection of toxic formaldehyde gas indoors. The results showed that PCT was the most efficient adsorption coating material for host-guest recognition of formaldehyde molecule, when the coating mass was 43.93 μg. The PCT based QCM sensor possessed a linear response range of 109 ~ 2721 ppm formaldehyde gas. In comparison with gas chromatography method, the QCM sensor had a recovery of 97.98~104.59 % with a good reversibility, stability and reproducibility, showing that the PCT based QCM sensor can be well used for the determination of trace formaldehyde in the living environment.
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Dissertations / Theses on the topic "QCM sensors"

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Peduru, Hewa Thamara Mangalika, and s3007291@student rmit edu au. "Development and evaluation of QCM sensors for the detection of influenza virus from clinical samples." RMIT University. Applied Science, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080516.160600.

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The Quartz crystal microbalance (QCM) is a very sensitive mass-detecting device which is based on changes in to the vibrational frequency of quartz crystals after adsorption of substances to a modified crystal surface. In this study a QCM-based biosensor was developed for the rapid diagnosis of influenza viruses and its suitability and limitations were compared with currently available diagnostic methods on 67 clinical samples (nasal washes) received during the 2005 Australian winter. The type-specific and conserved viral M1 proteins of both A/PR/8/34 and B/Lee/40 viruses were used to prepare polyclonal antisera for the development of an ELISA. The limits of detection of ELISAs for the detection of purified A/PR/8/34 and B/Lee/40 ƒnviruses were 20ƒÝg/mL ƒnand 14 ƒÝg/mL using polyclonal antibodies, and 30 ƒÝg/mL and 20 ƒÝg/mL for monoclonal antibodies, respectively. The limit for detection of each virus was 104 pfu/mL, irrespective of whether antisera or monoclonal antibodies were used for capture. Non-purified cell culture-grown preparations of either virus could be detected at 103 pfu/mL The QCM utilised the same reagents used in ELISAs. However, a number of parameters were then further optimised to improve the sensitivity of the tests. These included blocking of non-specific binding, examination of the effects of flow-cell compression, the role of pH, flow rate, antibody concentration and the addition of protein A to the crystal surfaces of the biosensor. The lowest virus concentration that could be detected with the QCM was 104 pfu/mL for egg-grown preparations of both A/PR/8/34 and B/Lee/40, which could be detected within 30 min. However, conjugation of 13 nm gold nanoparticles to a second detector antibody resulted in a 10-fold increase in sensitivity and a detection limit of 103 pfu/mL that could be determined within 1 h. The direct detection of the influenza viruses in nasal samples was not possible by QCM because of the significant frequency fluctuation that was probably caused by the viscosity of the samples. Therefore, an additional culture step of 12 h was required, which increased the processing time to 2 days. The QCM/nanoparticle method was shown to be as sensitive as the standard cell culture method, and the QCM method as sensitive as the shell vial method. The QCM and QCM/nanoparticle methods were shown to be 81 and 87% as sensitive and both were 100% as specific as the real-time polymerase chain reaction. However, for use in rapid diagnosis, improvements are required to remove frequency fluctuation resulting from the direct use of nasal samples.
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Weckman, Nicole Elizabeth. "Microfabricated acoustic sensors for the detection of biomolecules." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274899.

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MEMS (Microelectromechanical Systems) acoustic sensors are a promising platform for Point-of-Care biosensing. In particular, piezoelectrically driven acoustic sensors can provide fast results with high sensitivity, can be miniaturized and mass produced, and have the potential to be fully integrated with sample handling and electronics in handheld devices. Furthermore, they can be designed as multiplexed arrays to detect multiple biomarkers of interest in parallel. In order to develop a microfabricated biosensing platform, a specific and high affinity biodetection platform must be optimized, and the microfabricated sensors must be designed to have high sensitivity and maintain good performance in a liquid environment. A biomolecular sensing system that uses high affinity peptide aptamers and a passivation layer has been optimized for the detection of proteins of interest using the quartz crystal microbalance with dissipation monitoring (QCM-D). The resulting system is highly specific to target proteins, differentiating between target IgG molecules and other closely related IgG subclasses, even in complex environments such as serum. Piezoelectrically actuated MEMS resonators are designed to operate in flexural microplate modes, with several modes shown to be ideally suited for fluid based biosensing due to improved performance in the liquid environment. The increase in quality factor of these MEMS microplate devices in liquid, as compared to air, is further investigated through the analytical and finite element modeling of MEMS fluid damping mechanisms, with a focus on acoustic radiation losses for circular microplate devices. It is found that the impedance mismatch at the air-water interface of a droplet is a key contributor to reduced acoustic radiation losses and thus improved device performance in water. Microplate acoustic sensors operating in flexural plate wave and microplate flexural modes are then integrated with a fluidic cell to facilitate protein sensing from fluid samples. Flexural plate wave devices are used to measure protein mass adsorbed to the sensor surface and initial results toward microplate flexural mode protein sensing are presented. Finally, challenges and areas of future research are discussed to outline the path towards finalization of a sensing platform taking advantage of the combination of the sensitive MEMS acoustic sensor capable of operating in a liquid environment and the specific and high affinity biomolecular detection system. Together, these form the potential basis of a novel Point-of-Care platform for simple and rapid monitoring of protein levels in complex samples.
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Lee, Sang Hun. "Theoretical and Experimental Characterization of Time-Dependent Signatures of Acoustic Wave Based Biosensors." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11631.

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The object of this thesis research is to facilitate the appraisal and analysis of the signatures of the modern acoustic wave biosensors, as well as to improve the experimental methodology to enhance sensor performance. For this purpose, both theoretical characterization of acoustic wave sensor signatures and experimental studies for the most frequently used acoustic wave biosensors, the liquid phase QCM (quartz crystal microbalance) and the vapor phase SAW (surface acoustic wave) sensors, are presented. For the study of SAW vapor phase detection, the author fabricated different types of two-port SAW resonator sensors on quartz substrates and designed and performed a significant number of detection experiments. These were conducted both with calibrated or known target samples under laboratory conditions at Georgia Tech Hunt Lab and with samples of unknown concentrations such as seized crack cocaine (courtesy of Georgia Bureau of Investigation, GBI) to see the sensors capability to work in the field conditions. In addition, the dependence of the SAW sensor signatures on specific locations of the surface perturbation was investigated to account for some observed abnormal responses. Finally, a novel approach to classify and visualize chemically analogous substances is introduced. The author expects that the thesis work herein may contribute to the study of the modern acoustic wave biosensors which includes but is not limited to: the establishment of underpinning theory that will aid in the evaluation of the signatures; the practical aspects of design and fabrication of SAW devices specific to the vapor phase immunoassay; the development of efficient experimental methodologies; the strategic immobilization of a biolayer on SAW resonator based biosensors; and, the acquisition of reference data for the development of commercial acoustic wave sensors.
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Stubbs, Desmond Dion. "Development of an Acoustic Wave Based Biosensor for Vapor Phase Detection of Small Molecules." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/10412.

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For centuries scientific ingenuity and innovation have been influenced by Mother Natures perfect design. One of her more elusive designs is that of the sensory olfactory system, an array of highly sensitive receptors responsible for chemical vapor recognition. In the animal kingdom this ability is magnified among canines where ppt (parts per trillion) sensitivity values have been reported. Today, detection dogs are considered an essential part of the US drug and explosives detection schemes. However, growing concerns about their susceptibility to extraneous odors have inspired the development of highly sensitive analytical detection tools or biosensors known as electronic noses. In general, biosensors are distinguished from chemical sensors in that they use an entity of biological origin (e.g. antibody, cell, enzyme) immobilized onto a surface as the chemically-sensitive film on the device. The colloquial view is that the term biosensors refers to devices which detect the presence of entities of biological origin, such as proteins or single-stranded DNA and that this detection must take place in a liquid. Our biosensor utilizes biomolecules, specifically IgG monoclonal antibodies, to achieve molecular recognition of relatively small molecules in the vapor phase.
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García, Narbón José Vicente. "Improved characterization systems for quartz crystal microbalance sensors: parallel capacitance compensation for variable damping conditions and integrated platform for high frequency sensors in high resolution applications." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/63249.

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[EN] Different electronic interfaces have been proposed to measure major parameters for the characterization of quartz crystal microbalance (QCM) during the last two decades. The measurement of the adequate parameters of the sensor for a specific application is very important, since an error in this measure can lead to an error in the interpretation of the results. The requirements of the system of characterization depend on the application. In this thesis we propose two characterization systems for two types of applications that involve the majority of sensor applications: 1) Characterization of materials under variable damping conditions and 2) Detection of substances with high measurement resolution. The proposed systems seek to solve the problems detected in the systems currently in use. For applications in which the sensor damping varies during the experiment, we propose a system based on a new configuration of the technique of automatic capacitance compensation (ACC). This new configuration provides the measure of the series resonance frequency, the motional resistance and the parallel capacitance of the sensor. Moreover, it allows an easy calibration of the system that improves the precision in the measurement. We show the experimental results for 9 and 10 MHz crystals in fluid media, with different capacitances in parallel, showing the effectiveness in the capacitance compensation. The system presents some deviation in frequency with respect to the series resonance frequency, as measured with an impedance analyser. These deviations are due to the non-ideal, specific behaviour of some of the components of the circuit. A new circuit is proposed as a possible solution to this problem. For high-resolution applications we propose an integrated platform to characterize high-frequency acoustic sensors. The proposed system is based on a new concept in which the sensor is interrogated by means of a very stable, low-noise external source at a constant frequency, while the changes provoked by the charge in the phase of the sensor are monitored. The use of high-frequency sensors enhances the sensitivity of the measure, whereas the design characterization system reduces the noise in the measurement. The result is an improvement in the limit of detection (LOD). This way, we achieve one of the challenges in the acoustic high-frequency devices. The validation of the platform is performed by means of an immunosensor based in high fundamental frequency QCM crystals (HFF-QCM) for the detection of two pesticides: carbaryl and thiabendazole. The results obtained for carbaryl are compared to the results obtained by another high-frequency acoustic technology based in Love sensors, with the optical technique based in surface plasmonic resonance and with the gold standard technique Enzyme Linked Immunoassay (ELISA). The LOD obtained with the acoustic sensors HFF-QCM and Love is similar to the one obtained with ELISA and improves by one order of magnitude the LOD obtained with SPR. The conceptual ease of the proposed system, its low cost and the possibility of miniaturization of the quartz resonator, allows the characterization of multiple sensors integrated in an array configuration, which will allow in the future to achieve the challenge of multianalyte detection for applications of High-Throughput Screening (HTS).
[ES] Durante las dos últimas décadas se han propuesto diferentes interfaces electrónicos para medir los parámetros más importantes de caracterización de los cristales de microbalanza de cuarzo (QCM). La medida de los parámetros adecuados del sensor para una aplicación específica es muy importante, ya que un error en la medida de dichos parámetros puede resultar en un error en la interpretación de los resultados. Los requerimientos del sistema de caracterización dependen de la aplicación. En esta tesis se proponen dos sistemas de caracterización para dos ámbitos de aplicación que comprenden la mayoría de las aplicaciones con sensores QCM: 1) Caracterización de materiales bajo condiciones de amortiguamiento variable y 2) detección de sustancias con alta resolución de medida. Los sistemas propuestos tratan de resolver la problemática detectada en los ya existentes. Para aplicaciones en las que el amortiguamiento del sensor varía durante el experimento, se propone un sistema basado en una nueva configuración de la técnica de compensación automática de capacidad (ACC). La nueva configuración proporciona la medida de la frecuencia de resonancia serie, la resistencia dinámica y la capacidad paralelo del sensor. Además, permite una fácil calibración del sistema que mejora la precisión en la medida. Se presentan resultados experimentales para cristales de 9 y 10MHz en medios fluidos, con diferentes capacidades en paralelo, demostrando la efectividad de la compensación de capacidad. El sistema presenta alguna desviación en frecuencia con respecto a la frecuencia resonancia serie, medida con un analizador de impedancias. Estas desviaciones son explicadas convenientemente, debidas al comportamiento no ideal específico de algunoscomponentes del circuito. Una nueva propuesta de circuito se presenta como posible solución a este problema. Para aplicaciones de alta resolución se propone una plataforma integrada para caracterizar sensores acústicos de alta frecuencia. El sistema propuesto se basa en un nuevo concepto en el que el sensor es interrogado, mediante una fuente externa muy estable y de muy bajo ruido, a una frecuencia constante mientras se monitorizan los cambios producidos por la carga en la fase del sensor. El uso de sensores de alta frecuencia aumenta la sensibilidad de la medida, por otro lado, el sistema de caracterización diseñado reduce el ruido en la misma. El resultado es una mejora del límite de detección (LOD). Se consigue con ello uno de los retos pendientes en los dispositivos acústicos de alta frecuencia. La validación de la plataforma desarrollada se realiza con una aplicación de un inmunosensor basado en cristales QCM de alta frecuencia fundamental (HFF-QCM) para la detección de dos pesticidas: carbaryl y tiabendazol. Los resultados obtenidos para el Carbaryl se comparan con los obtenidos con otra tecnología acústica de alta frecuencia basada en sensores Love, con la técnica óptica basada resonancia superficial de plasmones (SPR) y con la técnica de referencia Enzyme Linked Immuno Assay (ELISA). El LOD obtenido con los sensores acústicos HFFQCM y Love es similar al obtenido con las técnicas ELISA y mejora en un orden de magnitud al obtenido con SPR. La sencillez conceptual del sistema propuesto junto con su bajo coste, así como la capacidad de miniaturización del resonador de cuarzo hace posible la caracterización de múltiples sensores integrados en una configuración en array, esto permitirá en un futuro alcanzar el reto de la detección multianalito para aplicaciones High-Throughput Screening (HTS).
[CAT] Durant les dues últimes dècades s'han proposat diferents interfases electrònics per a mesurar els paràmetres més importants de caracterització dels cristalls de microbalança de quars (QCM). La mesura dels paràmetres adequats del sensor per a una aplicació específica és molt important, perquè un error en la interpretació dels resultats pot resultar en un error en la interpretació dels resultats. Els requeriments del sistema de caracterització depenen de l'aplicació. En aquesta tesi, es proposen dos sistemes de caracterització per a dos àmbits d'aplicació que comprenen la majoria de les aplicacions amb sensors QCM: 1) Caracterització de materials sota condicions d'amortiment variable i 2) detecció de substàncies amb alta resolució de mesura. Els sistemes proposats tracten de resoldre la problemàtica detectada en els ja existents. Per a aplicacions en les quals l'amortiment del sensor varia durant l'experiment, es proposa un sistema basat en una nova configuració de la tècnica de compensació automàtica de capacitat (ACC). La nova configuració proporciona la mesura de la freqüència de ressonància sèrie, la resistència dinàmica i la capacitat paral¿lel del sensor. A més, permet un calibratge fàcil del sistema que millora la precisió de la mesura. Es presenten els resultats experimentals per a cristalls de 9 i 10 MHz en mitjans fluids, amb diferents capacitats en paral¿lel, demostrant l'efectivitat de la compensació de capacitat. El sistema presenta alguna desviació en freqüència respecte a la freqüència ressonància sèrie, mesurada amb un analitzador d'impedàncies. Aquestes desviacions són explicades convenientment, degudes al comportament no ideal específic d'alguns components del circuit. Una nova proposta de circuit es presenta com a possible solució a aquest problema. Per a aplicacions d'alta resolució es proposa una plataforma integrada per a caracteritzar sensors acústics d'alta freqüència. El sistema proposat es basa en un nou concepte en el qual el sensor és interrogat mitjançant una font externa molt estable i de molt baix soroll, a una freqüència constant mentre es monitoritzen els canvis produïts per la càrrega en la fase del sensor. L'ús de sensors d'alta freqüència augmenta la sensibilitat de la mesura, per altra banda, el sistema de caracterització dissenyat redueix el soroll en la mateixa. El resultat és una millora en el límit de detecció (LOD). S'aconsegueix amb això un dels reptes pendents en els dispositius acústics d'alta freqüència. La validació de la plataforma desenvolupada es realitza amb una aplicació d'un immunosensor basat en cristalls QCM d'alta freqüència fonamental (HFF-QCM) per a la detecció de dos pesticides: carbaryl i tiabendazol. Els resultats obtinguts per al carbaryl es comparen amb els obtinguts amb altra tecnologia acústica d'alta freqüència basada en sensors Love, amb la tècnica òptica basada en ressonància superficial de plasmons (SPR) i amb la tècnica de referència Enzyme Linked Immuno Assay (ELISA). El LOD obtingut amb els sensors acústics HFF-QCM i Love és similar al obtingut amb les tècniques ELISA i millora en un ordre de magnitud el obtingut amb SPR. La senzillesa conceptual del sistema proposat junt amb el seu baix cost, així com la capacitat de miniaturització del ressonador de quars fa possible la caracterització de múltiples sensors integrats en una configuració en array, el que permetrà en un futur assolir el repte de la detecció multianalit per a aplicacions High-Throughput Screening (HTS).
García Narbón, JV. (2016). Improved characterization systems for quartz crystal microbalance sensors: parallel capacitance compensation for variable damping conditions and integrated platform for high frequency sensors in high resolution applications [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/63249
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Zhang, Chen. "Piezoelectric-Based Gas Sensors for Harsh Environment Gas Component Monitoring." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1538769/.

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In this study, gas sensing systems that are based on piezoelectric smart material and structures are proposed, designed, developed, and tested, which are mainly aimed to address the temperature dependent CO2 gas sensing in a real environment. The state-of-the-art of gas sensing technologies are firstly reviewed and discussed for their pros and cons. The adsorption mechanisms including physisorption and chemisorption are subsequently investigated to characterize and provide solutions to various gas sensors. Particularly, a QCM based gas sensor and a C-axis inclined zigzag ZnO FBAR gas sensor are designed and analyzed for their performance on room temperature CO2 gas sensing, which fall into the scope of physisorption. In contrast, a Langasite (LGS) surface acoustic wave (SAW) based acetone vapor sensor is designed, developed, and tested, which is based on the chemisorption analysis of the LGS substrate. Moreover, solid state gas sensors are characterized and analyzed for chemisorption-based sensitive sensing thin film development, which can be further applied to piezoelectric-based gas sensors (i.e. Ca doped ZnO LGS SAW gas sensors) for performance enhanced CO2 gas sensing. Additionally, an innovative MEMS micro cantilever beam is proposed based on the LGS nanofabrication, which can be potentially applied for gas sensing, when combined with ZnO nanorods deposition. Principal component analysis (PCA) is employed for cross-sensitivity analysis, by which high temperature gas sensing in a real environment can be achieved. The proposed gas sensing systems are designated to work in a high temperature environment by taking advantage of the high temperature stability of the piezoelectric substrates.
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Anderson, Henrik. "Development of Electroacoustic Sensors for Biomolecular Interaction Analysis." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-107211.

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El, Sabahy Julien. "Couches minces organo-siliciées déposées par PECVD pour la fonctionnalisation de capteurs de gaz." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI115/document.

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La détection de gaz est un enjeu de plus en plus important, aussi bien dans le domaine de la surveillance de la qualité de l’air -intérieur et extérieur- que dans le suivi de procédés. Cet enjeu est d’autant plus critique dans le cas des composés organiques volatiles (COVs) que leur impact sur la santé publique est avéré. Détecter et quantifier leur présence devient une problématique majeure et différentes solutions existent. L’une d’elles, basée sur le couplage d’une nano-poutre résonnante et d’une micro colonne de chromatographie, s’avère être une solution prometteuse. Ces deux dispositifs alliant sélectivité et grande sensibilité nécessitent cependant une fonctionnalisation à l’aide d’une couche sensible. Ces travaux se sont focalisés sur le développement de matériaux sensibles de la famille des SiOCH déposés en couche mince par dépôt chimique en phase vapeur assisté par plasma (PECVD). L’étude de la réponse sous gaz des différents matériaux synthétisés au cours de cette thèse a été réalisée à l’aide de microbalances à cristal de quartz (QCM). Les mesures obtenues ont ensuite été corrélées à un modèle simple permettant de proposer une interprétation de l’interaction entre les SiOCH et le gaz d’intérêt, à l’équilibre mais aussi en régime dépendant du temps. La première partie de l’étude montre l’impact de la composition chimique de ces matériaux sur leur affinité envers un gaz représentatif des COVs aromatiques : le toluène. En s’appuyant sur des caractérisations physico-chimiques, le rôle de différentes liaisons chimiques ainsi que celui de l’hydrophobie des couches minces sur l’interaction avec le gaz d’intérêt a été analysé. Ces travaux montrent qu’un compromis entre composition chimique et hydrophobie doit être trouvé afin de préserver affinité et temps de réponse des SiOCH. L’étude de l’influence de la porosité sur la sensibilité a ensuite été abordée dans un second temps. Pour cela, des procédés originaux de réalisation de couches minces poreuses ont été développés afin de proposer de nouveaux matériaux poreux et d’accroître leur sensibilité vis-à-vis du toluène. Les limites de l’approche soustractive généralement utilisée pour ce type de matériau (i.e. l’approche porogène) ont pu ainsi être dépassées en termes de porosité et de tailles de pores. Concernant la détection de gaz, il s’avère difficile de décorréler l’impact de la chimie de celui de la porosité. Quoi qu’il en soit, l’augmentation de la porosité ouverte n’apparait pas comme le seul paramètre pertinent pour accroître la sensibilité de ces matériaux aux faibles concentrations
Gas detection is a growing field, both for indoor and outdoor air quality monitoring and for process monitoring. It is indeed particularly critical in the case of volatile organic compounds (VOC) whose impact on public health is proven. Detecting and quantifying their presence becomes a major problem and various solutions are available. One of them, based on the coupling of a resonant beam and a chromatography micro column, appears to be a promising solution. Those two devices combine selectivity and high sensitivity; however, they require functionalization with a sensitive layer. This work focused on SiOCH thin films deposited by PECVD. The gas interaction of the sensitive layers deposited during this work was studied using quartz crystal microbalances (QCM). The obtained measurements were then correlated to a simple model, providing an interpretation of the interaction – for steady-state but also kinetic regime - between the SiOCH and the gas of interest. The first part of the study shows the impact of the chemical composition of those materials on their affinity for toluene, representative for aromatic VOCs. Relying on physico-chemical characterization techniques, the role of various chemical bonds on the solid/gas interaction was investigated. This work shows that a compromise between chemical composition and hydrophobicity has to be reached to preserve SiOCH affinity and temporal response. The influence of porosity was then explored in a second step to further increase the sensitivity of those materials. Original deposition processes were developed in order to propose new porous materials with higher toluene affinity. The limits of the subtractive approach generally used for these PECVD materials (i.e. the porogen approach) were then overcome in terms of porosity and pore size. Concerning gas detection, it is difficult to decorrelate between the impact of chemistry and porosity. Whatever, increasing porosity does not appear to be the only relevant parameter in order to increase these materials affinity at low concentrations
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Kumar, Abhishek. "Development, characterization and experimental validation of metallophthalocyanines based microsensors devoted to monocyclic aromatic hydrocarbon monitoring in air." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22635/document.

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This PhD work is dedicated to investigate potentialities of phthalocyanines materials to realize a Quartz Crystal Microbalance (QCM) sensor for Benzene, Toluene and Xylenes (BTX) detection in air. The goal is to develop a sensor-microsystem capable of measuring BTX concentrations quantitatively below the environmental guidelines with sufficient accuracy. To achieve these objectives, our strategies mainly focused on experimental works encompassing sensors realization, sensing material characterizations, development of gas-testing facility and sensor testing for different target gases. One of the main aims is to identify most appropriate phthalocyanine material for sensor development. After comparative sensing studies, tert-butyl-copper phthalocyanine based QCM device is found as most sensitive and detail metrological characteristics are further investigated. Results show repeatable, reversible and high magnitude of response, low response and recovery times, sub-ppm range detection limit, high resolutions and combined selectivity of BTX gases among common atmospheric pollutants. Special focus is given to understand the gas/material interactions which are achieved by (a) XRD and SEM characterizations of sensing layers, (b) formalization of a two-step adsorption model and (c) assessing extent of diffusion of target gas in sensing layer. At last, possible ageing of sensor and suitable storage conditions to prevent such effect are investigated
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Fostock, Ziad. "QCM Sensor Chip : – Construction of plastic parts for injection molding." Thesis, KTH, Maskinkonstruktion (Inst.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-100017.

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I augusti 2007 tillfrågades författaren av Attana AB om han kunde konstruera dennes QCM-sensorchip för formsprutning som en del av hans examensarbete inom industriell design. Examensarbetet innefattade de två plastdelarna som utgör hölget av sensorchipet. Ytterliggare skulle en ny konstruktionslösning som underlättar montering av sensorchipet föreslås, en given plats för identifikationsmärkning av sensorchipet skulle implementeras och den estetiska aspekten av designen skulle slutföras inom ramarna av arbetet. Arbetsprocessen innebar ett tvärdisciplinärt uppdrag som ingenjör, designer och projektledare i nära samarbete med andra utvecklings- och tillverkningsingenjörer, materialspecialister och biokemister. Arbetet fortskred iterativt genom fyra faser, nämligen: förstudie, analys, syntes och utvärdering. Arbetet resulterade i en förenklad monteringskonstruktion och en integrerad plats för identifikationsmärkning av chipet. Designen och konstruktionen var också till en viss gräns verifierade med hänsyn till generiska riktlinjer för formsprutning och av specialister som undersökte konstruktionslösningen. En konstruktionslösning där ett snäppfäste integrerades för att underlätta montering av delarna presenterades av författaren. Dessutom presenterades ett urval av lämpliga material. I framtida arbete måste formsprutningsverktygsmakaren slutföra nödvändiga beräkningar för att tillåta eftersökta toleranser i det formsprutade sensorchipet.
In August 2007 the author was asked by Attana AB to construct its QCM sensor chip for injection molding as part of his Master Thesis in Industrial Design Engineering. The thesis work concerned the plastic housing of the sensor chip which consists of two plastic parts. In addition, a new construction solution that simplified assembly was to be proposed, a designated area for identification tagging was to be integrated into the design, and the aesthetic aspect of the design was to be finalized. The process implied working cross-disciplinary as an engineer, designer and a project manager in close collaboration with other development engineers, manufacturing engineers, material specialists and biochemists. The work iteratively progressed through the four phases: research, analysis, synthesis and evaluation. The work resulted in simplified assembly construction and the integration of a designated feature for identification-tagging. The design and construction were also verified, to a certain extent, respective of generic guidelines for injection molding and from specialists who reviewed the construction. A construction solution was proposed with an integrated snap fit design to allow simplified assembly. A selection of materials was also presented. Further investigation has to be done on behalf of the mold tool manufacturer in order to finalize the construction and with respect to tolerances.
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Books on the topic "QCM sensors"

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IEEE International Workshop on Computer Architecture for Machine Perception and Sensing (8th 2006 Montréal, Québec). 2006 IEEE International Workshop on Computer Architecture for Machine Perception and Sensing: Montréal, QC, Canada, 18-20 September 2006. Piscataway, NJ: IEEE, 2006.

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Robert, Barnes, McClain C. R, and Goddard Space Flight Center, eds. In situ aerosol optical thickness collected by the SIMBIOS Program (1997-2000): Protocols, and data QC and analysis. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 2001.

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Book chapters on the topic "QCM sensors"

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Perrot, Hubert. "Piezoelectric Transduction (QCM)." In Chemical Sensors and Biosensors, 71–91. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118561799.ch4.

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Alvisi, M., P. Aversa, G. Cassano, E. Serra, M. A. Tagliente, M. Schioppa, R. Rossi, D. Suriano, E. Piscopiello, and M. Penza. "Organic Vapor Detection by QCM Sensors Using CNT-Composite Films." In Lecture Notes in Electrical Engineering, 79–85. Boston, MA: Springer US, 2011. http://dx.doi.org/10.1007/978-1-4614-0935-9_14.

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Korotcenkov, Ghenadii. "Platforms and Materials for QCM and SAW-Based Humidity Sensors." In Handbook of Humidity Measurement, 271–80. Boca Raton : CRC Press, Taylor & Francis Group, 2018-[2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9781351056502-19.

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Berouaken, Malika, Chafiaa Yaddadene, Katia Chebout, Maha Ayat, Hamid Menari, Sabrina Belaid, and Noureddine Gabouze. "CO2 Gas Sensors Based on Hydrophilic Vanadium Oxide Thin Film Coated QCM." In ICREEC 2019, 633–38. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5444-5_79.

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Moriizumi, Toyosaka, Takamichi Nakamoto, and Yuichi Sakuraba. "Odor-Sensing System Using QCM Gas Sensors and an Artificial Neural Network." In Olfaction and Taste XI, 694–98. Tokyo: Springer Japan, 1994. http://dx.doi.org/10.1007/978-4-431-68355-1_279.

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Penza, M., P. Aversa, R. Rossi, M. Alvisi, G. Cassano, D. Suriano, and E. Serra. "Enhanced Mass Sensitivity of Carbon Nanotube Multilayer Measured by QCM-Based Gas Sensors." In Lecture Notes in Electrical Engineering, 271–77. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1324-6_42.

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Addabbo, Tommaso, Andrea Baldi, Mara Bruzzi, Ada Fort, Marco Mugnaini, and Valerio Vignoli. "QCM Sensors Based on In2O3 Nano-films Obtained by a Pulsed Plasma Deposition Technique." In Lecture Notes in Electrical Engineering, 65–69. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66802-4_10.

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Omatu, Sigeru, Hideo Araki, Toru Fujinaka, Michifumi Yoshioka, and Hiroyuki Nakazumi. "Mixed Odor Classification for QCM Sensor Data by Neural Networks." In Advances in Intelligent and Soft Computing, 1–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28765-7_1.

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Rao, B. Kameswara, P. Suresh Kumar, Dukka Karun Kumar Reddy, Janmenjoy Nayak, and Bighnaraj Naik. "QCM Sensor-Based Alcohol Classification by Advance Machine Learning Approach." In Lecture Notes in Electrical Engineering, 305–20. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8439-8_25.

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Bhagya Lakshmi, K., D. Ajitha, and K. N. V. S. Vijaya Lakshmi. "RT-GATE: Concept of Micro Level Polarization in QCA." In IoT and Analytics for Sensor Networks, 61–69. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2919-8_6.

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Conference papers on the topic "QCM sensors"

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Esmaeilzadeh, Hamed, George Cernigliaro, Junwei Su, Lin Gong, Iman Mirzaee, Majid Charmchi, and Hongwei Sun. "The Effects of Material Properties on Pillar-Based QCM Sensors." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52533.

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Quartz crystal microbalance (QCM) device is a highly sensitive mass sensor (sensitivity: 0.5 ng/cm2) with a wide range of applications including biosensing, thin film deposition, surface chemistry, volatile organic compounds (VOC) and gaseous analytes detection. A recent study shows that several orders of magnitude improvement in sensitivity can be achieved by attaching microscale Polymethyl methacrylate (PMMA) pillars onto the surface of the QCM (QCM-P) to form a two-degree of freedom coupled resonant system. In this research, the effects of residual layer from the nanoimprinting process of micro-pillars and polydispersity index (Pd) of PMMA molecules on the sensitivity of QCM-P devices are investigated both experimentally and theoretically. The results show the residual layer behaves as an additional mass and significantly reduces the frequency shift of QCM-P sensor while a low polydispersity of PMMA improves the sensor responses. The outcome of this research leads to an in-depth understanding of the effects of material and fabrication process on QCM-P sensors which will build a solid foundation for the further improvement of QCM-P devices for a variety of applications such as protein binding measurement in drug discovery, gas detection for environmental monitoring and protection.
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Sen, Z., I. Gurol, G. Gumus, E. Musluoglu, M. Harbeck, V. Ahsen, and Z. Z. Ozturk. "Organophosphate sensing with vic-dioximes using QCM sensors." In 2010 Ninth IEEE Sensors Conference (SENSORS 2010). IEEE, 2010. http://dx.doi.org/10.1109/icsens.2010.5690501.

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Li, Ning, Xiaofeng Meng, Jing Nie, Qiyang Huang, and Liwei Lin. "A New Type of Hydrophilic QCM Dew Point Sensor." In 2018 IEEE Sensors. IEEE, 2018. http://dx.doi.org/10.1109/icsens.2018.8589766.

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Hamid, A. S., A. F. Holloway, A. Hassan, and A. Nabok. "Investigation of Zinc phthalocyanine films for QCM sensing applications." In 2015 IEEE Sensors. IEEE, 2015. http://dx.doi.org/10.1109/icsens.2015.7370405.

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Xu, Xiahong, Yanbin Li, Jiang Zhou, Zhou Nie, and Shouzhuo Yao. "Peptide inhibitor based QCM biosensor for rapidly detecting protein kinase activity." In 2012 IEEE Sensors. IEEE, 2012. http://dx.doi.org/10.1109/icsens.2012.6411407.

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M. V., Popova, Farafonova O. V., and Ermolaeva T. N. "Applicability of Carbon Nanotubes in Qcm Sensors." In Nanomaterials and Technologies – VI. Buryat State University Publishing Department, 2016. http://dx.doi.org/10.18101/978-5-9793-0883-8-66-71.

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Zhen Yuan, Hulling Tai, Xiaohua Bao, Zongbiao Ye, Chunhua Liu, and Yadong Jiang. "Enhancement humidity sensing properties of graphene oxide/Poly(ethyleneimine) film QCM sensors." In 2015 IEEE Sensors. IEEE, 2015. http://dx.doi.org/10.1109/icsens.2015.7370400.

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Yuan, Yong J., and Kui Han. "Development of a real-time QCM bond-rupture system for POCT applications." In 2015 IEEE Sensors. IEEE, 2015. http://dx.doi.org/10.1109/icsens.2015.7370589.

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Tsuchiya, Yuta, Hiroyuki Kukita, Tsuyoshi Shiobara, Kazuki Yukumatsu, and Eiji Miyazaki. "Temperature Controllable QCM Sensor with Accurate Temperature Measurement for Outgas and Contamination Assessment." In 2019 IEEE SENSORS. IEEE, 2019. http://dx.doi.org/10.1109/sensors43011.2019.8956952.

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Lin, Chang-Yu, I.-Yu Huang, and En-Chang Wu. "The effect of glutaraldehyde cross-linking layer on QCM based alpha-fetoprotein biosensor." In 2009 IEEE Sensors. IEEE, 2009. http://dx.doi.org/10.1109/icsens.2009.5398242.

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