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Gotowa bibliografia na temat „Photoconductivity - ZnO based Nanocomposites”

Autor: Grafiati

Data publikacji: 7 września 2023

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Artykuły w czasopismach na temat "Photoconductivity - ZnO based Nanocomposites"

Han, Lei, Wen Li, Chao Meng, Yan Chen i Shan Fan. "Charge transport mechanism of polyaniline/ZnO nanocomposites based on inorganic/organic heterojunctions". MATEC Web of Conferences 179 (2018): 02005. http://dx.doi.org/10.1051/matecconf/201817902005.

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The key to improve the photocurrent is how to promote the generation rate and reduce the recombination rate of the photo-hole pair. In this paper, a p-n heterjunction structure in Polyaniline (PANI)/ZnO nanocomposites was formed via mechanical mixing process. Compared with ZnO, PANI doped ZnO nanocomposites exhibit obviously enhanced response. It might be attributed to the p-n heterojunctions formed between p-type and n-type enhanced response, enhancing the charge separation and in turn promoting the photoconductivity of the film. The 5at-%PANI doped ZnO nanocomposites demonstrates the highest response.

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Petrov, Victor V., Victor V. Sysoev, Irina O. Ignatieva, Irina A. Gulyaeva, Maria G. Volkova, Alexandra P. Ivanishcheva, Soslan A. Khubezhov, Yuri N. Varzarev i Ekaterina M. Bayan. "Nanocomposite Co3O4-ZnO Thin Films for Photoconductivity Sensors". Sensors 23, nr 12 (15.06.2023): 5617. http://dx.doi.org/10.3390/s23125617.

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Thin nanocomposite films based on zinc oxide (ZnO) added with cobalt oxide (Co3O4) were synthesized by solid-phase pyrolysis. According to XRD, the films consist of a ZnO wurtzite phase and a cubic structure of Co3O4 spinel. The crystallite sizes in the films increased from 18 nm to 24 nm with growing annealing temperature and Co3O4 concentration. Optical and X-ray photoelectron spectroscopy data revealed that enhancing the Co3O4 concentration leads to a change in the optical absorption spectrum and the appearance of allowed transitions in the material. Electrophysical measurements showed that Co3O4-ZnO films have a resistivity up to 3 × 104 Ohm∙cm and a semiconductor conductivity close to intrinsic. With advancing the Co3O4 concentration, the mobility of the charge carriers was found to increase by almost four times. The photosensors based on the 10Co-90Zn film exhibited a maximum normalized photoresponse when exposed to radiation with wavelengths of 400 nm and 660 nm. It was found that the same film has a minimum response time of ca. 26.2 ms upon exposure to radiation of 660 nm wavelength. The photosensors based on the 3Co-97Zn film have a minimum response time of ca. 58.3 ms versus the radiation of 400 nm wavelength. Thus, the Co3O4 content was found to be an effective impurity to tune the photosensitivity of radiation sensors based on Co3O4-ZnO films in the wavelength range of 400–660 nm.

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Bian, Lin, Shi Sheng Lv, Jian Xun Qiu, Xin Tao Zhang, Ming Jun Gao, Xiao Chun He, Xing Fa Ma i Guang Li. "Organic Functionalization and Properties of ZnO Nanosheets with Polymer Containing N-Vinyl Carbazole". Materials Science Forum 898 (czerwiec 2017): 2118–27. http://dx.doi.org/10.4028/www.scientific.net/msf.898.2118.

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To make full use of the visible light more effectively, many studies are focuses on ZnO baesd nanocomposites. To modify the surface of ZnO with functional polymer is a very simple and effective approach. PVK (N-vinyl carbazole polymer) is one of typical organic functional materials, which is generally used as charge transfer materials for the applications of several organic electronic devices. Surface modification of ZnO nanosheets with polymer containing –COOH and N-vinyl carbazole group was performed with self-assembly process for improving the adsorption to visible light and properties of charge transfer in nanoscale. A series of characterizations were carried out by SEM (scanning electron microscopy), Fourier-Transform Infrared (FTIR) spectra, UV-Vis (Ultra-violet visible spectroscopy), et al. The adsorption of the nanocomposite was extended to the region of visible light. The photoconductivity response to weak visible light was studied based on interdigital electrodes of Au on flexible PET (polyethylene terephthalate) film substrate with casting method. The photocurrent of ZnO nanosheets modified with the polymer containing N-vinyl carbazole to weak visible light was changed greatly. The organic-inorganic nanocomposite showed good activities to visible light, with which it can be easily produced photo-induced charges, avoiding the recombination of charges produced by visible light. Photocatalytic efficiency was examined by selecting typical organic pollutants and some good results were obtained, showing much prospect in the fields of photocatalysts, nanoreactors, self-cleaning films, coatings, and organic pollutants treatment of environmental.

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Guo, Bin, Bo Zhang, Qin Cong, Lu Wei Ma, Xiao Chun He, Ming Jun Gao, Lin Bian, Xing Fa Ma i Guang Li. "Surface Modification of Low-Dimensional Heterostructured Functional Materials with Dendrimers and their Properties of Organic-Inorganic Nanocomposites". Materials Science Forum 847 (marzec 2016): 299–307. http://dx.doi.org/10.4028/www.scientific.net/msf.847.299.

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Low-dimensional heterostructured functional materials have been widely applied in new energy materials, catalysts, et al. However, to enhance photo-response in visible light and the biocompatibility improvement are still the great challenges faced. And the dendrimers act good roles in transferring the drug and gene, and has good biocompatibility. Self-assembly on the surface of low-dimensional heterostructured functional materials with dendrimers holding-COOH groups was carried out in this paper. The characterizations of the materials were examined by SEM (scanning electron microscopy), XRD (X-ray diffraction), the Fourier-Transform Infrared (FTIR) spectra, ultraviolet-visible spectroscopy (UV-Vis) and so on. The photoconductivity response to visible light and 808 nm laser with low-power were studied based on interdigital electrodes of Au on flexible PET (polyethylene terephthalate) film substrate. The results indicated that ZnO/CuS modified with dendrimers showed good photo-response to visible light and 808 nm laser, the photo-response properties enhanced greatly by adding some small amount of grapheme oxide. Photocatalytic efficiency was examined by selecting typical organic pollutants, some good results were obtained. The external stimuli driven nanorobots for removal the organic pollutants or toxins in the living body have been developed.

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Chizhov, Artem, Marina Rumyantseva, Nikolay Khmelevsky i Andrey Grunin. "Sensitization of ZnO Photoconductivity in the Visible Range by Colloidal Cesium Lead Halide Nanocrystals". Nanomaterials 12, nr 23 (5.12.2022): 4316. http://dx.doi.org/10.3390/nano12234316.

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In this work, colloidal perovskite nanocrystals (PNCs) are used to sensitize the photoconductivity of nanocrystalline ZnO films in the visible range. Nanocrystalline ZnO with a crystallite size of 12–16 nm was synthesized by precipitation of a zinc basic carbonate from an aqueous solution, followed by annealing at 300 °C. Perovskite oleic acid- and oleylamine-capped CsPbBr3, CsPb(Cl/Br)3 and CsPb(Br/I)3 PNCs with a size of 6–13 nm were synthesized by a hot injection method at 170 °C in 1-octadecene. Photoconductive nanocomposites were prepared by applying a hexane sol of PNCs to a thick (100 μm) polycrystalline conductive ZnO layer. The spectral dependence of the photoconductivity, the dependence of the photoconductivity on irradiation, and the relaxation of the photoconductivity of the obtained nanocomposites have been studied. Sensitization of ZnO by CsPbBr3 and CsPb(Cl/Br)3 PNCs leads to enhanced photoconductivity in the visible range, the maximum of which is observed at 460 and 500 nm, respectively; close to the absorption maximum of PNCs. Nanocomposites ZnO/CsPb(Br/I)3 turned out to be practically not photosensitive when irradiated with light in the visible range. The data obtained are discussed in terms of the position of the energy levels of ZnO and PNCs and the probable PNCs photodegradation. The structure, morphology, composition, and optical properties of the synthesized nanocrystals have also been studied by XRD, TEM, and XPS. The results can be applied to the creation of artificial neuromorphic systems in the visible optical range.

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Wu, Jun, Huayao Li, Yuan Liu i Changsheng Xie. "Photoconductivity and trap-related decay in porous TiO2/ZnO nanocomposites". Journal of Applied Physics 110, nr 12 (15.12.2011): 123513. http://dx.doi.org/10.1063/1.3662954.

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Uddin, Islam. "An Overview of Photoconductivity in Zn-based Nanomaterials". Advanced Nano Research 3, nr 1 (16.10.2020): 46–50. http://dx.doi.org/10.21467/anr.3.1.46-50.

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Photoconductivity is a phenomenon in which the electrical conductivity of a material increases upon exposure to light. Zn-based nanomaterials, including ZnO and ZnS nanoparticles, nanowires, and nanorods, have gained considerable attention in recent years due to their unique photoconductive properties. Photoconductivity is a fundamental property of materials that refers to the increase in electrical conductivity upon absorption of light. This paper provides an overview of photoconductivity in Zn-based nanomaterials, including the mechanisms of photoconductivity, and the factors affecting it, such as size, morphology, and doping, and highlights the prospects of zinc-based nanomaterials in optoelectronics.

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Tzeng, Shi-Kai, Min-Hsiung Hon i Ing-Chi Leu. "Persistent Photoconductivity of Solution-Grown ZnO–Based UV Detectors". Journal of The Electrochemical Society 158, nr 11 (2011): H1188. http://dx.doi.org/10.1149/2.086111jes.

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Wang, Chao-Jun, Xun Yang, Jin-Hao Zang, Yan-Cheng Chen, Chao-Nan Lin, Zhong-Xia Liu i Chong-Xin Shan. "Ultraviolet irradiation dosimeter based on persistent photoconductivity effect of ZnO". Chinese Physics B 29, nr 5 (maj 2020): 058504. http://dx.doi.org/10.1088/1674-1056/ab8891.

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Chitra, M., G. Mangamma, K. Uthayarani, N. Neelakandeswari i E. K. Girija. "Band gap engineering in ZnO based nanocomposites". Physica E: Low-dimensional Systems and Nanostructures 119 (maj 2020): 113969. http://dx.doi.org/10.1016/j.physe.2020.113969.

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Rozprawy doktorskie na temat "Photoconductivity - ZnO based Nanocomposites"

Ibrahem, Mohammed A. "Multiwavelength photoconductivity of ZnO nanoparticles based on surface defects and plasmonics". Thesis, University of Hull, 2017. http://hydra.hull.ac.uk/resources/hull:16599.

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ZnO is distinguished as the semiconductor of choice in a variety of applications such as in optoelectronics and photodetectors owing to its superior light sensitivity, the ease of synthesis in a wide range of nanostructure forms and its tuneable optical and electrical properties. Herein, ZnO photoconductivity is investigated for two purposes; firstly, to assess device stability with different preparation conditions and environments and secondly, to improve and extend photodetection of ZnO into the visible and near-infrared by stimulating surface defects and plasmonics effect. Persistent photoconductivity resulting from UV irradiation of ZnO NP films is highly affected not only by oxygen adsorption but also by other organic species and water in atmospheric air. The stability of ZnO photodetector is found to be enhanced in terms of current magnitude and sustainable photocurrent cycles when the device is prepared, annealed and tested in a nitrogen environment. A noticeable difference is identified in the ZnO NP surface composition, represented by surface organic complexes when the film is prepared and annealed in air compared to nitrogen. The aforementioned species are found to be removed efficiently in oxidized fabrication environment such as in air while partially decomposed in nitrogen. This enables the ZnO surface to build new organic species and surface carbonates by electrochemical reaction with atmospheric CO2 leading to promote electrically active defects surface states. Narrow-band photoconductivity, with a spectral width of 0.16 eV, is obtained by irradiating ZnO NP films using green light. A new model involving electron transfer from deep defects to discrete shallow donors is introduced to explain the narrow spectrum and the exponential form of the current rise and decay transients. The green photocurrent responsivity can be enhanced by storage in air and this correlates with the formation of carbonate surface species by the capture of carbon dioxide during storage. We successfully demonstrated a solution-processed ZnO NP photodetector using a low-cost and scalable photolithographic approach to fabricate dual (ultraviolet and green) and single (ultraviolet only) wavelength detecting ZnO pixels on the same substrate using the same mask. We also show that the plasmonic effect can be used to extend the photoconductivity of ZnO NPs into the deep red/infrared spectral region utilizing gold nanoislands as a light absorber and source of hot electrons in a vertical device configuration involving PEDOT: PSS.

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Doddapaneni, Venkatesh. "On the polymer-based nanocomposites for electrical switching applications". Doctoral thesis, KTH, Tillämpad fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202702.

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Recent research demonstrated that polymer based nanocomposites (PNCs) have been engineered in order to improve the arc interruption capability of the circuit breakers. PNCs are the combination of nano-sized inorganic nanoparticles (NPs) and polymers, opened up new developments in materials science and engineering applications. Inorganic NPs are selected based on their physical and chemical properties which could make multifunctional PNCs in order to interrupt the electrical arcs effectively. In particular, we presented the PNCs fabricated by using CuO, Fe3O4, ZnO and Au NPs in a poly (methyl methacrylate) (PMMA) matrix via in-situ polymerization method, recently developed method to avoid NPs agglomeration, leading to good spatial distribution in the polymer matrix. Thus, several samples with various wt% of NPs in PMMA matrix have been fabricated. These PNCs have been characterized in detail for the morphology of NPs, interaction between NPs and polymer matrix, and radiative/thermal energy absorption properties. In the next stage, PNCs are tested to determine their arc interruption performance and impact on the electrical arcs of current 1.6 kA generated using a specially designed test set-up. When PNCs interact with the electrical arcs, they generate ablation of chemical species towards core of the electrical arc, resulting in cooling-down the arc due to strong temperature and pressure gradient in the arc quenching domain. This thesis demonstrates for the first time that these engineered PNCs are easily processed, reproducible, and can be used to improve the arc interruption process in electrical switching applications.
Ny forskning har visat att polymerbaserade nanokompositer (PNCs) har utformats för att förbättra strömbrytares förmåga att undvika ljusbågar vid överslag. PNCs är en kombination av nanostora oorganiska nanopartiklar (NP) och polymerer, som har öppnat upp för ny utveckling inom materialvetenskap och tekniska tillämpningar. Oorganiska NP väljs baserat på deras fysikaliska och kemiska egenskaper som kan hjälpa PNCs att motverka elektriska ljusbågar effektivt. I synnerhet, presenterade vi PNCs tillverkade genom användning av CuO, Fe3O4, ZnO och Au NP i en poly (metylmetakrylat) (PMMA)-matris via in situ-polymerisationsmetod, nyligen utvecklad för att undvika NP-agglomerering, vilket leder till god rumslig fördelning i polymermatrisen. Därför har flera prover med olika vikt% av NP i PMMA-matris tillverkats. Dessa PNCs har utvärderats i detalj för NP-morfologi, interaktion mellan NP och polymermatris, och strålnings- och värmeenergiabsorption. I nästa skede testas PNCs för att bestämma deras förmåga att undvika ljusbågar och påverkan på de elektriska ljusbågarna av 1,6 kA strömstyrka, genererade med hjälp av en specialdesignad test-set-up. När PNCs interagerar med de elektriska ljusbågarna, genererar de ablation av kemiska ämnen mot kärnan i den elektriska ljusbågen, vilket resulterar i nedkylning av ljusbågen på grund av starka temperatur- och tryckgradienter i området. Denna avhandling visar för första gången att dessa konstruerade PNCs är lätta att framställa, reproducerbara, och kan användas för att förbättra avbrottsprocessen för ljusbågen i elektriska kopplingstillämpningar.

QC 20170303

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Shen, Xiu-Ru, i 沈秀如. "Light-Emitting Diodes Based On p-GaN/n-ZnO Nanorods-Carbon Dots Nanocomposites Prepared by the Hydrothermal Method". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ft5m53.

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碩士
國立臺灣海洋大學
光電科學研究所
105
The p-GaN/n-ZnO nanorods light-emitting diodes (LEDs) with near-ultraviolet electroluminesce (EL) based on ZnO:carbon dots composites were realized. The emission intensity can be tuned by adjusting the concentrations of carbon dots in the precursors of ZnO NRs. The enhanced light output power of energy efficient p-GaN/n-ZnO composite nanorods LEDs reported here can be possibly attributed to the important role of carbon dots in ZnO/carbon dots composite nanorods acting as a conducting network in the ZnO active matrix that leads to the surface plasmon(SP) enhanced light emission and the improved electrical conductivity. Our work proposed a simple route to fabricate efficient near-ultraviolet LEDs assisted by additions of carbon dots.

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Islam, Sk Emdadul, i 安柏卓. "Wet chemical synthesis of ZnO and transition metal dichalcogenide based low-dimensional nanocomposites for highly efficient photocatalytic activity". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8gf9s3.

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博士
國立中山大學
材料與光電科學學系研究所
107
This dissertation describes the synthesis of low-dimensional nanostructures via a series of facile aqueous solution methods at low temperature (<2000C). We started with the fabrication of vertically aligned ZnO nanorods (NRs) on aluminum-doped zinc oxide (AZO) substrates by a single-step aqueous solution method. In order to strengthen photoluminescence (PL) property, ZnO nanorod arrays were annealed at various temperature. We found that the annealing temperature strongly affects both the near-band-edge (NBE) and visible (defect-related) emissions, this eventually leads to the understanding of the optimum annealing condition to achieve enhanced optical properties. Some important findings were found from the PL study, for example, the enhancement of NBE is due to the activation of radiative recombinations associated to hydrogen donors (Ho), and the reduction of visible emission is mainly because of the annihilation of OH groups from the ZnO surface. This interesting finding motivated us to synthesis ZnO hybrids so that we can exploit its promising optical properties in the photocatalysis application under UV or visible light illumination. Next, the plasmonic Au nanoparticles were deposited on the ZnO nanorod arrays to fabricate a noble metal/semiconductor hybrid structures. Interestingly, this Au/ZnO platform exhibits amazing UV-Vis photocatalytic activity alongside the strong luminescent properties. The visible-light active photocatalysis is assisted by localized surface plasmon resonance (LSPR) excitations while the strong absorption and charge separation under UV irradiation is responsible for enhanced catalytic performance. Besides, the enhancement in optical properties is mainly due to local field enhancement effect and the coupling between exciton and LSPR. For the first time, we showed that the plasmonic enhancement of photocatalytic performance is not necessarily a trade-off for enhanced near-band-edge emission in Au/ZnO. The excellent emission property and photocatalytic activity results motivated us to combine low-dimensional ZnO nanostructures with some earth-abundant two-dimensional (2D) materials as a replacement of expensive noble metals. Thus, we prepared heterodimensional nanostructures of 2D ultrathin MoS2 nanosheets interspersed with ZnO nanoparticles by using a facile two-step method. Foremost sonication-aided liquid phase exfoliation technique (LPE) was used to exfoliate ultrathin MoS2 nanosheets in ethanol/water solvent, subsequently a wet chemical process was employed to realize interspersion of ZnO nanoparticles onto the MoS2 surface. In this case, ultra-thin MoS2 nanosheets acted as the support for the nucleation of various concentrated small ZnO dots. The photocatalytic activity of the ZnO/MoS2 nanocomposites was performed with organic dye pollutants and tetracycline, a common antibiotic, as a model compound under visible-light irradiation. We found extremely high catalytic efficiency with these composites under visible light, where the reaction rate of pollutant degradation is about eight times higher than those of commercial P25-TiO2 photocatalysts. This outstanding photocatalytic activity of the heterodimensional hybrids results from the synergetic effects of ZnO and MoS2. Most importantly, the heterojunction formation between ZnO and MoS2 facilitates the separation of photogenerated active charge carriers, leading to the enhancement of photocatalytic performance. Moreover, a tentative mechanism for photocatalytic degradation was proposed in this report, which can provide valuable insights for the exploration of cost-effective nanoscale hybrids constructed from atomically thin layered materials. Finally, we have synthesized mesoporous C-ZnO nanostructured via a facile one-step hydrothermal process, and then liquid-exfoliated 2D MoS2 nanosheets were integrated with the C-ZnO through simple thermal treatment to obtain C-ZnO@MoS2 composites. The photocatalytic activity was evaluated under visible light irradiation and we found the significant enhancement in photodegradation of organic dye molecules by the introduction of MoS2 nanosheet on C-ZnO. Such a significant photoactivity could be attributed to the MoS2 nanosheets that strengthen the visible-light absorption to create the electrons and holes in the system and their favourable separation occur by the electron transaction between ZnO, and MoS2. The synergistic effect between carbon, MoS2 and ZnO makes C-ZnO@MoS2 composites a suitable visible-light driven photocatalyst.

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Części książek na temat "Photoconductivity - ZnO based Nanocomposites"

Zahmouli, N., S. G. Leonardi, A. Bonavita, M. Hjiri, L. El Mir, Nicola Donato i G. Neri. "High Performance VOCs Sensor Based on ɣ-Fe2O3/Al-ZnO Nanocomposites". W Lecture Notes in Electrical Engineering, 25–30. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-04324-7_4.

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Pyrz, Ryszard. "Optical and Piezoelectric Properties of ZnO Nanowires and Functional Polymer-Based Nanocomposites". W Frontiers in Materials Science and Technology, 107–10. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-475-8.107.

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Goswami, Lalit, Anamika Kushwaha, Shivani Goswami, Yogesh Chandra Sharma, TaeYoung Kim i Kumud Malika Tripathi. "Nanocarbon-based-ZnO nanocomposites for supercapacitor application". W Nanostructured Zinc Oxide, 553–73. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-818900-9.00008-5.

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"Graphene-Based ZnO Nanocomposites for Supercapacitor Applications". W Graphene as Energy Storage Material for Supercapacitors, 181–208. Materials Research Forum LLC, 2020. http://dx.doi.org/10.21741/9781644900550-7.

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Saraswat, Vibhav K. "ZnO nanofillers–based polymer and polymer blend nanocomposites". W Nanostructured Zinc Oxide, 157–86. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-818900-9.00023-1.

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Díez-Pascual, Ana M. "Biodegradable food packaging nanocomposites based on ZnO-reinforced polyhydroxyalkanoates". W Food Packaging, 185–221. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-804302-8.00006-6.

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Basnet, Parita, i Somenath Chatterjee. "Biogenic synthesis of Ag-ZnO nanocomposites: Characterization, mechanisms, and applications". W Zinc-Based Nanostructures for Environmental and Agricultural Applications, 13–36. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-822836-4.00017-3.

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Ge, Hui, Weixing Wang, Lichun Huang, Mingxing Tang i Zhenyu Ge. "The Relation of Ni/ZnO Nano Structures With Properties of Reactive Adsorption Desulfurization". W Nanocomposites for the Desulfurization of Fuels, 134–67. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2146-5.ch005.

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Ni/ZnO nano-sorbent systems have been extensively used in the reactive adsorption desulfurization (RADS) of gasoline steams, especially in China, to meet the more rigorous regulation on the sulfur content. The apparent advantage of RADS is that most of the olefins are kept in the product with low consumption of hydrogen and little loss of octane. The authors discussed in this chapter the relation of catalytic properties with components and structures of Ni/ZnO sorbent. Based on detailed characterization and reaction results, they revealed the dynamic change of Ni/ZnO sorbents during RADS, the mechanisms of desulfurization, and the sulfur transfer and sulfur adsorption. Apart from the RADS of Ni/ZnO nano-sorbent for cleaner gasoline production, they also presented other potential applications.

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Panchatcharam, Parthasarathy. "Synthesis and Characterization of CoO-ZnO-Based Nanocomposites for Gas-Sensing Applications". W Multilayer Thin Films - Versatile Applications for Materials Engineering. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.88760.

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Rana, G. "Advances on ZnO Hetro-Structure as Nanoadsorbant for Heavy Metal Removals". W ZnO and Their Hybrid Nano-Structures, 173–201. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902394-6.

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Industrialization is going at an incredibly fast rate, which is putting more and more heavy metals in the water we drink. Almost all heavy metals are very toxic, and even a small amount of these metals in water can be very bad for humans and for the aquatic ecosystems that live in the water. As a result, the removal of heavy metals from industrial effluents is a big deal. Due to their high surface area to volume ratio, nanoadsorbents have received substantial attention in the past decade for their ability to remove heavy metals from water. Due to its good biocompatibility, low toxicity, negative zeta potential, surface changes during development, and redox reactions resulting from the production of efficient photoinduced electron-hole pairs in ZnO nanoparticles, ZnO is a suitable material for heavy metal remediation. In this chapter, we have discussed the synthesis method of ZnO NPs and their nanocomposites. Also in this chapter, we'll go over how ZnO nanostructures can be used to remove heavy metal ions from water. Various ZnO-based nanostorbents, including virgin ZnO NPs, doped ZnO nanostructures, ZnO nanocomposites, and surface-modified ZnO NPs, are fully examined, with statistical analyses of their maximum adsorption capacity for various heavy metal ions (Cd2+, Hg2+, Pb2+, Cr6+, and Cu2+).

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Streszczenia konferencji na temat "Photoconductivity - ZnO based Nanocomposites"

Poghosyan, Armen R., Natella R. Aghamalyan, Elbak Y. Elbakyan, Ruyan Guo, Ruben K. Hovsepyan i Silva I. Petrosyan. "Photoconductivity of ZnO based granular structures". W SPIE Optical Engineering + Applications, redaktorzy Shizhuo Yin i Ruyan Guo. SPIE, 2014. http://dx.doi.org/10.1117/12.2062954.

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Zhao, Yingjun, Kenneth J. Loh i Donghee Chang. "Piezoelectric and Mechanical Performance Characterization of ZnO-Based Nanocomposites". W 19th Analysis and Computation Specialty Conference. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41131(370)11.

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Nair, Manjula G., Meenakshi Malakar, Saumya R. Mohapatra i Avijit Chowdhury. "Synthesis of ZnO nanorods and observation of resistive switching memory in ZnO based polymer nanocomposites". W 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032506.

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Youssef, Ahmed, i Islam EL-Nagar. "Preparation and Characterization of PMMA Nanocomposites Based On Zno-Nps for Antibacterial Packaging Applications". W The 5th World Congress on New Technologies. Avestia Publishing, 2019. http://dx.doi.org/10.11159/icnfa19.105.

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Guan, Huanan, Jialiang Jiang, Dandan Chen, Wei Wang, Yan Wang i Jiaying Xin. "Acetylcholinesterase biosensor based on chitosan/ZnO nanocomposites modified electrode for amperometric detection of pesticides". W 2015 International Conference on Materials, Environmental and Biological Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/mebe-15.2015.39.

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Abdul-kareem, Asma Abdulgader, Noura AlSanari, Amal Daifallah, Radwa Mohamed, Jolly Bhadra, Deepalekshmi Ponnamma i Noora Al-Thani. "Piezoelectric Nanogenerators based on Pvdf-Hfp/Zno Mesoporous Silica Nanocomposites for Self-Powering Devices". W Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0054.

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Due to the rising global concern over energy catastrophe and environmental issues, attention has been diverted towards future energy. In recent times, rechargeable power and renewable energy sources have been considered as an attractive substitute for resolving the future environmental problems. Among them, mechanical energy is one of the most abundant energy sources, and easily transformable to other useful energy forms, such as electrical energy. For such purposes, piezoelectric materials with ability to convert the mechanical energy generated by various activities into electrical energy. In this research work, we have investigated the morphology, structure and piezoelectric performances of neat polyvinylidene fluoride hexafluoropropylene (PVDF-HFP), PVDF-HFP/ZnO, PVDFHFP/ Mesoporous silica, PVDF-HFP 1% and PVDF-HFP 3% ZnO-Mesoporous silica nanofibers, fabricated by electrospinning. Both SEM and TEM images of ZnO nanoparticles shows formation of uniform flake of about 5nm diameter and Mesoporous silica shows uniform spherical morphology with average diameter of 5 μm. EDX plot justifies the presences of Zn, O and Si. An increase in the amount of crystalline β-phase of PVDF-HFP has been observed with the introduction of ZnO and mesoporous silica in the PVDF-HFP matrix are observed in FTIR spectra. All the XRD peaks observed in neat PVDF has the strongest intensity compared to rest of the other XRD peaks of polymer nanocomposite. The XRD spectra of all the nanocomposites have peaks at 17.8°, 18.6° correspond to α- crystalline phase, the peaks observed at 19°, 20.1° correspond to the γ- crystalline phase, and the peak at 20.6° corresponds to the β- crystalline phase. The flexible nanogenerator manipulated from the polymer nanocomposite with 1% ZnO-Mesoporous silica exhibits an output voltage as high as 2 V compared with the neat PVDF-HFP sample (~120 mV). These results indicate that the investigated nanocomposite is appropriate for fabricating various flexible and wearable self-powered electrical devices and systems.

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Skandani, Amir Alipour, Ayoub Yari Boroujeni i Marwan Al-Haik. "Temperature Dependent Viscoelastic Behavior of FRP/ZnO Nano-Rods Hybrid Nanocomposites". W ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63326.

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The inclusion of nanomaterials within fiber reinforced plastics (FRPs) could improve their resistance against time dependent deformation. Conceivable high temperature applications of such hybrid composites make it crucial to investigate their temperature-dependent properties as well as their durability. In this study, zinc oxide (ZnO) nano rods were grown on the surface of carbon fibers and the hybridized reinforcement was formed in a laminate composites. The viscoelastic behavior was probed utilizing dynamic mechanical analysis (DMA). The time/temperature superposition principle (TTSP) was invoked to obtain the viscoelastic properties of FRPs based on fibers with different surface treatments. Results indicated that the presence of ZnO nano rods at the interface between the carbon fibers and the epoxy matrix enhances the composite’s creep resistance at elevated temperatures and prolonged duration.

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ALEXANDRESCU, LAURENTIA. "ANTIBACTERIAL POLYMERIC NANOCOMPOSITES BASED ON PETr AND FUNCTIONALIZED ZnO NANOPARTICLES WITH APPLICATION IN THE FOOD INDUSTRIES". W 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings. STEF92 Technology, 2019. http://dx.doi.org/10.5593/sgem2019/6.1/s24.005.

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Drmosh, Q. A., Z. H. Yamani, A. H. Y. Hendi, M. A. Gondal i R. A. Moqbel. "P1GS.3 - A low Temperature H2 Gas Sensor Based on Pt-loaded Reduced Graphene Oxide/ZnO Nanocomposites". W 17th International Meeting on Chemical Sensors - IMCS 2018. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2018. http://dx.doi.org/10.5162/imcs2018/p1gs.3.

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Billings, Christopher, Peter Kim, Changjie Cai i Yingtao Liu. "Manufacturing and Characterization of Nanocomposites With Antibacterial Nanoparticles". W ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-94218.

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Abstract This paper will present the advanced manufacturing of a novel nanocomposite utilizing digital light processing (DLP) based 3D printing technology. The novel nanocomposite will be manufactured from a photocurable resin and zinc oxide in the 10–30 nm range with varying volume fraction ratios. Weight concentrations of 1–5% will be analyzed concerning tensile strength, water contact angle, and dispersion. In addition, samples will be examined through a scanning electron microscope (SEM) to demonstrate the lack of particle aggregation and voids within the part. The nanocomposites produced demonstrated a significant strength increase at 5% concentrations and an increase in water contact angle. An ultimate tensile strength of 39.51 Mpa was achieved on average compared to the neat resin control value of 31.63 Mpa. In addition, SEM analysis illustrated a properly dispersed nanoparticle with low amounts of agglomeration. The utilization of zinc oxide (ZnO) as a mechanical additive in DLP manufacturing demonstrated a novel method for increasing part strength with functional nanoparticles. Due to the design freedom gained with additive manufacturing, nanocomposites produced promise a greater strength-to-weight ratio than those manufactured through traditional methods.

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