Dissertations / Theses on the topic 'Self-assembled monolayer'
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Sporakowski, Laura. "Controlled patterning of self-assembled monolayer films." Master's thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-03172010-020130/.
Full textLu, Kexin. "Organic semiconductors for self-assembled monolayer field effect transistors." Thesis, University of Manchester, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.559330.
Full textBorthwick, Matthew A. "X-ray techniques for probing self-assembled monolayer structures." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ44129.pdf.
Full textMatemadombo, Fungisai. "Substituted phthalocyanines development and self-assembled monolayer sensor studies." Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1005029.
Full textJang, Chang-Hyun. "AFM-Assisted Nanofabrication using Self-Assembled Monolayers." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/11103.
Full textPh. D.
Huang, Fei. "Electrophysiological Studies of a Retinal Prosthetic Prototype." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-theses/970.
Full textSvedhem, Sofia. "Biomolecular interactions at model interfaces : a self-assembled monolayer approach /." Linköping : Univ, 2001. http://www.bibl.liu.se/liupubl/disp/disp2001/tek677s.pdf.
Full textGirot, Christine Stoll. "Infrared characterization of a self-assembled catenane monolayer on gold." Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1027114.
Full textDepartment of Chemistry
Sheikh, Khizar Hussain. "Surface forces in self-assembled monolayer and lipid bilayer systems." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424503.
Full textLee, Seok-Won 1970. "Molecular adsorption at solid/liquid interfaces using self-assembled monolayer films." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/50552.
Full textIncludes bibliographical references.
Many areas of technology rely on interfacial events that are controlled by nanometer-level interactions present at solid/liquid interfaces. Properties of wetting, corrosion inhibition, and molecular recognition provide convenient examples. To investigate such interactions at the molecular level, self-assembled monolayers (SAMs) have been employed as a model system as they offer the ability to produce well-defined organic surfaces of controlled composition. This thesis addresses the development and characterization of such films for controlling the adsorptive properties of surfaces toward various surfactant-like molecules and for proteins. Adsorption is controlled to facilitate the organized assembly of molecular precursors, retard the non-specific adsorption of proteins, provide a specificity for the adsorption of select proteins, and the use of molecular adsorption to generate local surface energy gradients useful for directing self propelled drop movement. A common theme in these studies is the importance of controlling the energetics and compositions of surfaces at the molecular level to influence microscopic events that translate into macroscopically observable changes in behavior. The first part of this thesis details the formation of monolayer films by the solution-phase adsorption of n-alkyl-chained adsorbates [CH 3(CH2)~ Y] onto the polar surfaces of terminally substituted SAMs [Au/S(CH)mX]. The polar tail groups (X and Y) of the adsorbate and SAM included amine, carboxylic acid, and amide groups, and the formation of the adsorbed monomolecular films on the SAMs relied on non-covalent interactions between X and Y. Highly organized monomolecular adlayers could be produced that were as densely packed as the alkanethiolate SAMs on gold comprising the first layer. This thesis also used this molecular adsorption process to cause liquid drops to move spontaneously on surfaces by creating local changes in surface energy. The drops could be directed to move along specified paths using patterned substrates that contained inner tracks of polar functionality and exterior domains of oleophobic methyl groups. The adsorption process allowed sequential transport of two drops on a common track and also regeneration of the initial high energy surface for reuse. The developed system provides an experimental platform for examining reactive flow and offers a novel "pumpless" method for sequentially delivering multiple drops along surfaces and within microfluidic devices. The second part of this thesis discusses various oligo(ethylene glycol)-terminated alkyltrichlorosilanes [C13Si(CH2)11(OCH2CHnX; X = -OCH 3 or -O 2CCH 3, n= 2- 4] that can form robust films on glass and metal oxide surfaces and control the adsorption of proteins. The adsorption of the methyl-capped trichlorosilanes produces densely packed, oriented monolayer films that are 2-3 nm in thickness. The trichlorosilyl group anchors the molecules to the surface, and the resulting film exposes the ethylene glycol units at its surface, as noted by its moderate hydrophilicity. The films are robust with stabilities similar to those of other alkylsiloxane coatings. These oligo(ethylene glycol)-terminated silane reagents produce films that exhibit resistances against the non-specific adsorption of proteins and that are better than for films prepared from octadecyltrichlorosilane. These oligo(ethylene glycol)-siloxane coatings offer performance advantages and could easily provide a direct and superior replacement for protocols that presently use silane reagents to generate hydrophobic, "inert" surfaces. This thesis also discusses the development of an acetate-capped oligo(ethylene glycol)-terminated silane to produce a HO-terminated oligo(ethylene glycol)-based coating on glass and metal oxide surfaces. The HO-termini of these films provide sites for covalently grafting biomolecules to the parent surface. As a demonstration, biotin and mannose moieties were covalently attached to the HO-surfaces to provide a means to induce the specific adsorption of proteins. For these surfaces, the presence of oligo(ethylene glycol) groups reduces the nonspecific adsorption of other competing proteins. The results indicate that the developed systems could offer a strategy to arrange biomolecules selectively on glass and metal oxide surfaces.
by Seok-Won Lee.
Ph.D.
Wood, Laurie Lynne 1969. "Cytochrome c films formed on silane self-assembled monolayer derivatized surfaces." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/288871.
Full textZabala, Mancebo Julen. "Alkylsilane self-assembled monolayer substrates to control mesenchymal stem cell differentiation." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/alkylsilane-selfassembled-monolayer-substrates-to-control-mesenchymal-stem-cell-differentiation(31d29fb1-f387-4545-9f4a-a1c65f5a4bad).html.
Full textHo, M. Y. "An investigation of redox self-assembled monolayer in label-free biosensor application." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604101.
Full textCapacci-Daniel, Christina Anne. "Crystal growth of polymorphic bis-diphenyl ureas on self-assembled monolayer templates." Connect to Electronic Thesis (CONTENTdm), 2009. http://worldcat.org/oclc/463440944/viewonline.
Full textSin, Lai Yi Mandy. "IN SITU ELECTROKINETIC SAMPLE PREPARATION FOR SELF-ASSEMBLED MONOLAYER BASED ELECTROCHEMICAL BIOSENSING." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/205176.
Full textRobuck, Holly Elizabeth. "Molecule-Based Negative Differential Resistance Across a Self-Assembled Monolayer: Its Dependence on Monolayer Coverage and Tunneling Gap." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-05192004-143129/.
Full textMasuda, Yoshitake, Won-Seon Seo, Kunihito Koumoto, 佳丈 増田, and 邦仁 河本. "Two-dimensional arrangement of fine silica spheres on self-assembled monolayers." Elsevier, 2001. http://hdl.handle.net/2237/6665.
Full textFischer, Marion. "Initiation of blood coagulation - Evaluating the relevance of specific surface functionalities using self assembled monolayers." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-38768.
Full textLi, Huimin. "Relationship between molecular structure and surface properties of self-assembled monolayers." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29056.
Full textPh. D.
Zhang, Minhui. "Investigation of structure and permeability of surfaces modified with self-assembled monolayers." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-08222008-063703/.
Full textRosidian, Aprillya. "Nanocomposite of ZrO2/Polymer Thin-Film Coatings by the Ionically Self-Assembled Monolayer Technique." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36560.
Full textMaster of Science
Erdy, Christine. "Self-Assembled Host-Guest Thin Films for Functional Interfaces." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/36049.
Full textMaster of Science
Campos, Rui César de Almeida. "Studies of electron transfer in self-assembled monolayers and bilayer lipid membranes." Thesis, Durham University, 2012. http://etheses.dur.ac.uk/3899/.
Full textWu, Jun. "Surface Modified Electrodes and Their Reactivity." Case Western Reserve University School of Graduate Studies / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1144448160.
Full textMancheno-Posse, Pablo, and Anthony J. Muscat. "Self-assembly of alkanethiolates directs sulfur bonding with GaAs(100)." Elsevier, 2017. http://hdl.handle.net/10150/623038.
Full textMcCoy, Kendra Michele. "Surface Monolayer Initiated Polymerization: A Novel Means of Fabricating Sub - 100 nm Features." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5232.
Full textSchiel, Philippe. "Study of light-triggered molecular motors self-assembled at surfaces and interfaces." Electronic Thesis or Diss., Strasbourg, 2024. https://publication-theses.unistra.fr/restreint/theses_doctorat/2024/Schiel_Philippe_2024_ED222.pdf.
Full textThe integration of molecular motors at interfaces allows to form highly organised assembled structures that use their molecular motion in order to obtain stimuli-responsive surfaces. In this thesis, we mainly studied the impact of UV light irradiation on amphiphilic molecular motors at the dynamic air-water interface and on surface-anchored molecular motors at solid interfaces. We show that the rotation of amphiphilic motors in Langmuir monolayers can induce large changes in the compressibility and the supramolecular structuration, leading to a first example of a motion induced supramolecular polymerisation process at interfaces. Herein, we also report a first study on surface-anchored motors by single molecule force spectroscopy, showing that the rotation of motors can be used to change the mechanical and conformational properties of the attached polymer chains. Further, we describe a system based on surface-anchored motors that can be used in mimicking the motion induced by a biological motor. Finally, we aimed to investigate a concrete application for the rotation of molecular motors by integrating them in commercially available ultrafiltration membranes
Uji, Hirotaka. "Investigation on Electronic Properties and Photocurrent Generation of Self-Assembled Peptides on Gold." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215964.
Full textTicha, Lawrence Awa. "Development of amperometric biosensor with cyclopentadienylruthenium (II) thiolato schiff base self-assembled monolayer (SAM) on gold." Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5394_1341319478.
Full text5-C2H5]2 was synthesized and deposited as a selfassembled monolayer (SAM) on a gold electrode. Effective electronic communication between the Ru(II) centers and the gold electrode was established by electrostatically cycling the Shiff base-doped gold electrode in 0.1 M NaOH from -200 mV to +600 mV. The SAMmodified gold electrode (Au/SAM) exhibited quasi-reversible electrochemistry. The integrity of this electro-catalytic SAM, with respect to its ability to block and electro-catalyze certain Faradaic processes, was interrogated using Cyclic and Osteryoung Square Wave voltammetric experiments. The formal potential, E0', varied with pH to give a slope of about - 34 mV pH-1. The surface concentration, &Gamma
, of the ruthenium redox centers was found to be 1.591 x 10-11 mol cm-2. By electrostatically doping the Au/SAM/Horseradish peroxidase at an applied potential of +700 mV vs Ag/AgCl, a biosensor was produced for the amperometric analysis of hydrogen peroxide, cumene hydroperoxide and tert-butylhydroperoxide. The electrocatalytic-type biosensors displayed typical Michaelis-Menten kinetics with their limits of detection of 6.45 &mu
M, 6.92 &mu
M and 7.01 &mu
M for hydrogen peroxide, cumene hydroperoxide and tert-butylhydroperoxide respectively.
Lin, Han-yi, and 林漢益. "Tribological Study of Self-Assembled Monolayer on Micromachine." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/12704403606148108326.
Full text國立中正大學
機械工程所
94
In the MEMS and precision machine, particles and liquid films (capillary force) are often presented at contact interfaces. These two factors will enhance the adhesion, friction and wear of contacting surfaces. In the meantime, in order to minimize the adhesion and wear problems of moving MEMS, numerous coating methods are being designed to improve these surface properties. Self-assembled monolayer (SAM) coating has been demonstrated to achieve anti-stiction and low friction characteristics when properly integrated into microstructure release process. The objective is to establish analysis and manufacture technology of SAMs in MEMS. For this purpose, several kinds of SAMs, including alkyl and biphenyl spacer chains with different surface terminal groups (-CH3,-COOH), and head groups (-SH), were prepared. The influence of spacer chains, surface terminal groups, and head groups on adhesion, friction and surface energy properties were investigated by AFM, nano tester and contact angle analyser. The effect of self-assembled monlayers on matrix surface and coating film characteristics. Moreover, in order to design the optimal surface, the effects of adhesion and capillary force of surface micromaching on the real contact area of microparts are investigated. In this study, it is found that HDT exhibits the smallest adhesive force and friction force, because of low work of adhesion of -CH3 surface terminal group, and high-compliance long carbon chain. The influence of velocity on friction forces of HDT film is very small. In order to design the optimal surface, we found that Vicker’ surface has lowest surface energy, and adhesion properties.
孫介偉. "Fabrication of Nanometer Scale Self-Assembled Monolayer Devices." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/05071359390456759302.
Full textChang, Hsuan-chun, and 張亘鈞. "Fabrication of TCO on Self-Assembled Monolayer Modified Glass." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/85599557965519861587.
Full text國立臺灣科技大學
化學工程系
98
In this work, we studied the deposition of ITO and AZO on self-assembled monolayer (SAM) modified glass substrate with RF sputtering. In general , deposition of ITO and AZO thin films under low temperature condition result in the amorphous or less crystallinity structures, which needed to be improved by post annealing of thin film at high temperature. However, in this study, we have found that high crystallinity can be achieved in low temperature by modification of glass substrate by SAMs prior to ITO and AZO deposition.The ITO with high electrical conductivitycan be fabricated by using –SH SAM modified glass substrate. We attributed the improvement of electrical conductivity to larger quantity of Sn atoms attached on thiol functional group. In addition, for the deposition of AZO, the surface tension of glass substrate was modulated by fabrication of SAMs with different functional groups, which the preferential growth direction of AZO thin film could be controlled to along c-axis or a-axis.
Chang, Yen-Cheng, and 張晏晟. "A study of self-assembled monolayer on artificial teeth." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/23793378282408412247.
Full text國立中正大學
機械工程所
96
Self-assembled monolayers(SAMs) have proven to be an efficient biomimetic strategy in the development of material with controllable surface properties. Self-assembled monolayers is a process in which molecules spontaneouslyorganize into ordered assemblies by noncovalent intermolecular force. In past years, self-assembled monolayers have been developed widely in many application field, such as optical instruments, electronics, biomedical application. Adsorption and adhesion of SAMs is of interest for use in dental application in past year. According to atomic force microscopy imaging, the SAM growing process as the formation of islands on the surface. Therefore, the wear and surface roughness(aesthetic) properties have to the considered in the future application. The purpose of this study was to investigate the possibility of achieving better mechanical properties in the artificial tooth with self-assembled monolayers. Self-assembled monolayers (ODPA,ODT,OTS,ODS) must possess biocompatible. The influence of artificial denture and SAMs on adhesion, surface energy, water hydrophobic, friction and anti-attrition by AFM, nano test, contact angle, ESCA and FTIR analyzer. Moreover, the optimal SAMs were choiced to apply to coating surface of industrial optimal product. In this study, it is found that ODPA, ODS, OTS and ODT of SAMs exhibit lower surface energy than artificial teeth surface. All of them can reduce adhesive force and friction force. In contact angle, the contact angles on the SAMs surface are larger than that on the artificial teeth. The contact angles of SAMs for OTS at six hours larger than the other surface film cases. The maximum contact angle is about 123°. For adhesive force test by AFM, the OTS film at six hours exhibit the smallest value. However, the reaction time is the important issue during fabrication process, two hours fabrication time of OTS film is the better choice. In order to chew food, teeth surface need a certain value of friction coefficient. In pin on disc friction model of indentation tester, ODS and ODT films have the better friction properties for all SAMs films. In ESCA, It may discover the O1s element has the certain influence to the SAMs, the contact angle is increased with decrease of counts/sec. In FTIR, it is found that contact angle is increased with increase of peak, show the molecular arranges neatly. In this study, it is found SAMs for OTS at six hours has best contact angle, smallest adhesion force and reduces the particle adsorption situation. These results suggest that SAMs have proven to be an efficient in the artificial teeth surface.
Liao, Min-Ling, and 廖敏玲. "Studies for Surface Self-Assembled Monolayer with Zwitterionic Groups." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/ha9z6y.
Full text國立成功大學
化學工程學系碩博士班
90
Abstract Due to the van der Waals forces between hydrocarbon chains and strong binding between gold and sulfur, the self-assembled monolayer formed by the long-chain alkanthiol has densely-packed, and well-oriented characteristics. On the other hand, varying the terminal functional groups of the self-assembled monolayer will affect various properties of the surface. This study is based on the structure of phospholipid, the most abundant component of the cell membrane. Due to the thermodynamic effect, phospholipid with long hydrophobic hydrocarbon chains and hydrophilic zwitterionic functional group has the self-assembly character. In other words, studying the self-assembled monolayer is just to mimic the structure of phospholipid properly. The starting material: 10-mercaptodecanyl phosphonic acid was synthesized according to the previous study. Because the solubility of this thiol in absolute ethanol was limited, other proper solvents were found to dissolve it. By the measurement of contact angle, it was found that different solvents would affect the structure of the self-assembled monolayer. Therefore, the surface would have the differences in hydrophilicity due to the solvent effect. To protect the monolayer formed from adsorbing contaminants in the air that could affect the following modification reaction, the phosphonic acid terminated SAM was stored in the proper solvent. Also, the measurement of contact angle had been done again before the surface was modified. As a result, it was proven the solvents can affect the reorganization of the monolayer structure. However, the hysteresis value of the surface in this study was similar to each other. According to the spectra of O1s、N1s、P2p、S2p in ESCA , the existence of the functional group on the surface has been proven. By correlating the variation within the spectrum characteristics and atomic ratio under different reaction conditions, it was found that thionyl chloride is indeed a strong oxidant, and may destroy the gold-sulfur binding on the surface. Consequently, the chances of choline acetate reacting with the monolayer were reduced. This indicates that both the amount of the thionyl chloride adding to the reaction system and the reaction time need to be considered carefully. As for the solvent used, both the reaction time of the reactants and the reaction temperature require further investigation.
"Kinetic mechanisms of self-assembled monolayer formation and desorption." Tulane University, 2000.
Find full textacase@tulane.edu
Chen, Li-Ren, and 陳立人. "Multifunctional Organic Spin Valve with Self-Assembled Monolayer Barrier." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/29597666046120940666.
Full text國立臺灣大學
物理研究所
101
We report the surface, magnetic and charge transport in organic spin valve structure (Ferromagnetic/Organic/Ferromagnetic) with self-assembled monolayer barrier. We have built top ferromagnetic electrode by transfer printing and sputtering to prevent interdiffusion or pinhole and observed that the interdiffusion could be suppressed by lowering the fabrication energy of the top ferromagnetic layer. A through study of the device characteristics reveals that the hysteresis on I-V measurement is proposed to contribute from tunneling through junction and charge trapping on the thiol and ferromagnetic interface. Magnetoresistance ratio is 1 % have reported in our system. We have demonstrated how the device can switch between two pair of conducting state for the potential of develop multifunction memory device which combine MRAM and RRAM properties
Wang, Yu-Sin, and 王裕昕. "Functionalizable Antifouling Zwitterionic Self-Assembled Monolayer for Biosensor Application." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/mk2v4y.
Full text國立中央大學
生醫科學與工程學系
105
Reducing nonspecific interaction of biomolecules with an electrode is a key issue for increasing sensitivity and specificity for biosensors. Zwitterionic materials, carrying both positively and negatively charged moieties in a molecule, have shown excellent biocompatibility by resisting undesired biomolecules adsorption. In particular, zwitterionic carboxybetaine materials are the most attractive. Besides the high resistance to nonspecific biomolecules adsorption, the carboxylic acid group can be transformed to functionalizable intermediates to create a ligand-functionalized substrate. Self-assembled monolayers (SAMs) are well-established as a means to selectively modify surfaces to achieve desired chemical and physical properties. In this study, we used carboxybetaine and sulfobetaine terminated alkanethiol to form mixed SAMs on gold surface. The zwitterion terminated mixed SAMs can provide functionalizable antifouling properties. X-ray photoelectron spectroscopy showed the molar ratio of carboxybetaine and sulfobetaine terminated alkanethiol molecular mixing in solution was in agreement with the feed-in molecules ratio. It supported that the composition of the surface molecules can be controlled by varying feed-in molar ratio in the solution. Surface plasmon resonance biosensor showed that there were the best ability of anti-fouling when carboxybetaine and sulfobetaine terminated alkanethiol mixed SAM with a molar ratio of 1 : 9. Under this condition, we can successfully attach the antibody on the surface via amino-coupled NHS / EDC chemical modification. Then, the surface was applied to the surface plasmon resonance sensor. The limit of detection was 80 ng/ml. The new type of biosensor interface offers anti-fouling properties and functionalizable capacity. It can meet the needs of the market to facilitate the development of biological sensors
ZHANG, WEN-HONG, and 張文鴻. "The effect of growth solvent on the properties of self-assembled monolayers and characterization of self-assembled-monolayer encapsulated electroless copper nanowires." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/qknx3w.
Full textLunsford, Patrick. "Stability of Self-Assembled Monolayer Surfactant Coating in Thermal Nanoimprint." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-9026.
Full textLiu, Yi-len, and 劉怡良. "Temperature dependence of molecular packing in self-assembled monolayer films." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/zfw4hj.
Full text國立中山大學
化學系研究所
96
An alkyl-containing self-assembled monolayer is grafted on the silicon surface by a nature process in solutions. The alkyl thin film was used as the lubricant for the silica interface, usually applied to the MEMS or NENS domains. The ability of reducing friction for silica device at room temperature was improved, but little was known as the thin films existed at higher temperature during device was working or operating. In this study, we used Hexyltrichlorosilane (C6), Dodecyltrichlorosilane (C12), and Octadecyltrichlorosilane (C18) molecules to form self-assembled monolayers (SAMs) on silicon, and these monolayers exhibited different molecular packing properties due to different interactions between the molecules. Fourier transform infrared spectroscopy (FTIR) revealed that the short chain-length (C6) molecules exhibited poor packing on the surface at room temperature, and that the molecular packing of C6 was thermally stable up to 500 K. But the C12 and C18 monolayers exhibited abrupt blue shifts in FTIR at temperatures between 300 and 575 K, with stable packing observed over several temperature ranges. Furthermore, water contact angle measurements showed the C6, C12, and C18 molecular films changed from hydrophobic to hydrophilic as the sample temperature was increased. Atomic force microscopy (AFM) images revealed that pits had formed in the C18 monolayer after the temperature was increased to 460 K, which were caused by the molecular reorganization of C18 on the surface. This resulted in an abrupt change in the friction coefficient for the C18 monolayer at 460K as compared to the short C6 and C12 monolayers. However, the friction coefficients for all the SAM films still increased with temperature. Understanding the temperature-dependent behavior of SAM film molecules will assist in the design of better anti-wear monolayers to improve performance and increase lifetimes in modern MEMS and NEMS devices.
Yi-WeiLiao and 廖翊惟. "Characteristic of polymer photodetectors by using self-assembled monolayer treatment." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/29yyu5.
Full text國立成功大學
微電子工程研究所
103
In this thesis, we have investigated the characteristics of polymer photodetector fabricated on transparent electrode which is treated by self-assembled molecule (SAM) treatment and we also compared the characteristics of each the devices. After the SAM attach on the surface of the transparent electrode, the work function of transparent electrode can be modulated due to the molecular dipole moment. By choosing different functional group of the SAM, the direction and magnitude of the dipole moment can be changed. We obtained the result that 1H,1H,2H,2H-Perfluorooctanephosphonic acid (FOPA) is useful for indium-tin oxide (ITO) from all of the SAMs used in this experiment. In processing time investigation, we obtained the same result between short time treatment and long time treatment (24hr) which is often seen in journal. The device with FOPA short time treatment modified on ITO has incident photon to current conversion efficiency (IPCE) 50% and the dark current was 60% reduced compared to non-treatment device. Furthermore, the detectivity was enhanced by 1.7 times. In the treatment of Poly (3,4-ethylendioxythiophene) dope with poly (4-styrenesulfonate) (PEDOT:PSS) which is often used as hole transport layer, the dark current was increased by 122 times due to the erosion of the ITO. Thus, the PEDOT:PSS was not suitable for organic photodetector fabrication. We also used the gallium-doped zinc oxide (GZO) substrate for device fabrication and found that the 2,3,4,5,6-Pentafluorobenzylphosphonic acid (FBPA) is useful for GZO. The device with modified on GZO has IPCE 47% and dark current was 62% reduced compared to non-treatment device. Furthermore, the detectivity was enhanced by 1.78 times. In the PEDOT:PSS based GZO devices, the short circuit current was not increased as in ITO. This might mainly due to the increase of the sheet resistance which was caused by hard erosion of the GZO. In this thesis, instead of PEDOT:PSS by using SAM, the photocurrent could be increased and the dark current could be decreased at the same time which results in the improved photodetector detectivity.
Ming-YangLin and 林銘洋. "Utilization of Self-assembled Monolayer for DNA-assisted Nanowire Lithography." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/58678029855261279236.
Full textHSIEN, CHUN, and 游俊賢. "A Bio-medical Study of Self-Assembled Monolayer on PMMA." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/27220027132820468968.
Full text國立中正大學
機械工程所
97
Macromolecular material Polymethyl Methacrylate (PMMA) has good nature in light transmission, bio-compatibility, chemical resistance, and mechanical strength. With its simple and cost-efficient production procedure, it is a very suitable for various material of bio-medical and chemical examination instruments. In this study, we tried to grow three self-assembled monolayers OTS, ODS, and HDT, with bio-compatibility, in the microchannel made of PMMA, in order to reduce time expense and increase examination accuracy of bio-microchannel chips. Findings of research were: in the contact angle experiment of three self-assembled layers, OTS illustrated the maximum contact angle 123° 24 hours after its reaction, while ODS and HDT showed 94° and 65° respectively. Through analysis by Fourier-Transform Infrared Spectrometer, we found that all the three self-assembled layers reached their maximum contact angles, which were caused by the increase of their terminal functionality CH3, indicating that self-assembled layers had better adhesion quality than the surface of its precursor PMMA. As experiment of static contact angle could not completely illustrate the flow ability of liquid which is to be examined, we suggested replacing the normal contact angle with dynamic inclination angle parameters as measurement indicator. The experiment showed that results of dynamic inclination angle parameters were inconsistent with those of contact angle, but more consistent with ability trend of friction coefficient. In the biotic experiment of protein concentration, OTS self-assembled film, after 24 hours reaction time, also showed the lowest protein residue. Therefore, more portion of the specimen could be maintained in the area of chip reaction and increased accuracy of test.
Lin, Yi-Sheng, and 林益陞. "IMPROVEMENT OF PENTACENE THIN FILM TRANSISTOR WITH SELF-ASSEMBLED MONOLAYER." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/62848625998380784218.
Full text大同大學
化學工程學系(所)
94
The best mobility for organic semiconductors has been reported for vacuum-deposited pentacene film. Pentacene organic thin-film transistor (OTFT) has drawn great attention because of it is advantages over conventional inorganic electronics such as low cost, large-area, and low processing temperature. Pentacene interactions between molecules in the crystal are rather weak van der Weals interactions. Thus, the dielectric (ex: hydrophobic….) can influence the morphology of the pentacene semiconductor. The purpose of this work is to show the improvement of OTFT performance by controlling the surface treatments of dielectric/organic layer interface. We investigated the electrical properties of the OTFTs using pentacene fabricated by thermal evaporation in high vacuum with the five kinds of dielectric surface treatments: as-prepared, hexamethyldisilasane ((CH3)3-Si-O-Si-(CH3)3) (HMDS), octadecyltrichlorosilane (C18H37SiCl3) (OTS), phenyltrichlorosilane (C6H5SiCl3) (PTS), and phenethyltrichlorosilane (C6H5C2H4SiCl3) (PETS) treatment. And we use x-ray diffractometer (XRD), atom force microscope (AFM), X-ray photoelectron spectroscopy (XPS), water contact angle, and semiconductor parametric test system (HP 4155C) equipments to analyze the properties of self-assembled monolayer (SAM), pentacene thin film, and the performance of the device, respectively. From the result, the mobility and on/off current ratio of pentacene OTFT are 0.34 cm 2 V –1 s –1 and 1.21 x 10 5 (top-contact) and 0.011 cm 2 V –1 s –1 and 2.31 x 10 4 (bottom-contact), respectively. From the result of AFM images, it can be seen that grain size of pentacene thin film deposited on the electrode region are significantly smaller compared to that of the channel region on SiO2. That discontinuity causes for the inferior performance of bottom-contact pentacene transistors compared to that of top-contact devices. The mobility and on/off current ratio of bottom-contact pentacene OTFT with OTS-treated SiO2 can be achieved 0.1 cm 2 V –1 s –1 and 1.71 x 10 5, respectively. XPS detects the chemical composition of surfaces in the top 50-100 Å. The results confirm OTS adsorbed on the surface of gate dielectric. Similarly, HMDS, PTS, and PETS treatments can affect good influence in filed effect mobility. The mobility and on/off current ratio of pentacene OTFT are 0.11 cm 2 V –1 s –1, 1.92 x 10 6 of PTS-treated and 0.07 cm 2 V –1 s –1, 5.29 x 10 5 of HMDS-treated, respectively. The best performance of device can be obtained by using PETS as SAM reagent. The mobility, on/off current ratio, threshold voltage, and subthrshold slope of pentacene OTFT are 0.13 cm 2 V –1 s –1, 4.17 x 10 6, - 2.4 V, 0.8 V/decade of PETS, respectively, which are enhanced one to two orders of magnitude larger than those of untreated SiO2 device. Furthermore, the pentacene OTFT performance with PTS- and PETS-treated gate dielectric can be obtained an outstanding subthrshold slope.
Wu, Kuan-Te, and 吳冠德. "Studies on Nanoelectrochemistry and Self-assembled Monolayer Dip-pen Nanolithography." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/34664662854134426498.
Full text南台科技大學
機械工程系
93
Characteristics and mechanism of the metal oxide structure produced by atomic force microscopy (AFM) anodization and dip-pen lithography (DPN) are studied. Effects of experimental parameters including the applied voltage, the anodization time and the electric field strength on the oxidation are discussed. Molecular dynamics (MD) simulation was employed to analyze the oxidation mechanism. The results show that the growth of the oxide structures increased as the applied voltage, the anodization time and the electric field strength were increased. The height and width of the nanodots was increased when the distance between the tip and the sample was increased. Furtheremore, the adhesion force and the contact angle of the self-assembled monolayers (SAM) were measured. The dip-pen lithography was developed with SAM.
Suriyanarayanan, Subramanian. "Structure, Stability And Interfacial Studies Of Self Assembled Monolayers On Gold And Silver Surfaces." Thesis, 2007. https://etd.iisc.ac.in/handle/2005/576.
Full textSuriyanarayanan, Subramanian. "Structure, Stability And Interfacial Studies Of Self Assembled Monolayers On Gold And Silver Surfaces." Thesis, 2007. http://hdl.handle.net/2005/576.
Full text"Towards Photocurrent Production By Gold Nanoarrays with Self-Assembled Monolayer Coatings." Thesis, 2011. http://hdl.handle.net/1911/70328.
Full textShu, Ming-Hsien, and 徐明顯. "The Study of Reorganization of Self-Assembled Monolayer on Silver Surface." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/70234970236248171066.
Full text國立清華大學
化學系
90
Abstract Self-assembled monolayers (SAMs) of n-hexadecanoic acid (1), p-terphenylcarboxylic acid (2), were prepared onto silver surface by adsorption from a solution of respective compound, all through the carboxylate/silver (CO2-/Ag) interaction. A brief exposure of the monolayer to H2S vapor leads to immediate protonation of the carboxylate head groups and reorganization of the resulting free acid molecules in the monolayer into clusters of H-bonded dimers of the acid. Mixed monolayer prepared from n-hexadecanoic acid (1) and p-terphenylcarboxylic acid (2) appears to form domains of respective component on silver surface. H2S-exposure of the mixed-monolayer also leads to a reorganization of the molecules in the monolayer. For mixed monolayer, the atomic force microscopy suggests that H2S-exposure leads to aggregates of respective compounds. The effect of a self-assembled monolayer on a substrate surface on the packing/orientation of vacuum-deposited p-terphenyl film was also investigated. The nearly perpendicular orientation of the terphenyl group in the SAM of p-terphenylcarboxylic acid caused perpendicular alignment of the p-terphenyl molecules in vacuum-deposited film, whereas H2S-treated SAM surface caused parallel alignment of the p-terphenyl molecules in the deposited film.
Hsu, Shu-Han, and 許舒涵. "Polymer solar cell using self-assembled monolayer modified ITO as anode." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/fm5xbk.
Full text國立臺北科技大學
有機高分子研究所
99
Polymer solar cells have gained wide interest in recent years, but how to further cut down the fabrication cost and increase the device lifetime is still an important issue for their commercialization. In this study, a series of assembled monolayers (SAMs) of benzoic acid with various para-substituted groups on ITO was employed to replace PEDOT:PSS as the electron blocking layer of polymer solar cells. In the first part of this thesis, contact angle, X-ray photoelectron spectroscope, and AFM were applied to study the SAMs of benzoic acid derivatives on ITO. AFM images showed the presence of SAMs slightly reduced the surface roughness of ITO. In addition, the effect of SAMs on the work function of ITO was examined using AC-2. The experimental results indicated that the electron donating ability of the para-substituent on benzoic acid had decisive effect on the work function of ITO. An electron donating moiety will up-shift the work function but an electron withdrawing group will down-shift the work function of ITO. Finally, the SAMs-modified ITO was used as transparent anode to fabricate P3HT/PCBM bulk heterojunction solar cells. I-V measurements demonstrated that as the para-substituent was –CN or –CF3 group, the SAMs-based device reached a power conversion efficiency of 3.64%, which is comparable to that of a conventional solar cells with PEDOT:PSS as electron blocking layer. In the second part, the SAMs-covered ITO which was patterned with ordered line-shaped groove was utilized as the anode of solar devices to shorten the transport pathway of hole. Preliminary results showed this patterned ITO is helpful in rising the short-circuit current. Further optimization on the thickness of photoactive layer and the dimension of groove is still undertaking by our group members.