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Yang B, To DTH, Resendiz Mendoza E, Myung NV. Achieving One Part Per Billion Hydrogen Sulfide (H 2S) Level Detection through Optimizing Composition and Crystallinity of Gold-Decorated Tungsten Trioxide (Au-WO 3) Nanofibers. ACS Sens 2024; 9:292-304. [PMID: 38215726 DOI: 10.1021/acssensors.3c01979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2024]
Abstract
As a common environmental pollutant and an important breath biomarker for several diseases, it is essential to develop a hydrogen sulfide gas sensor with a low-ppb level detection limit to prevent harmful gas exposure and allow early diagnoses of diseases in low-resource settings. Gold doped/decorated tungsten trioxide (Au-WO3) nanofibers with various compositions and crystallinities were synthesized to optimize H2S-sensing performance. Systematically experimental results demonstrated the ability to detect 1 ppb H2S with a response value (Rair/Rgas) of 2.01 using a 5 at % Au-WO3 nanofibers with average grain sizes of around 15 nm. Additionally, energy barrier difference of sensing materials in air and nitrogen (ΔEb) and power law exponent (n) were determined to be 0.36 eV and 0.7, respectively, at 450 °C indicating that O- is predominately ionic oxygen species and adsorption of O- significantly altered the Schottky barrier between the grain. Such quantitative analysis provides a comprehensive understanding of H2S detection mechanism.
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Affiliation(s)
- Bingxin Yang
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame 46556, Indiana, United States
| | - Dung Thi Hanh To
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame 46556, Indiana, United States
| | - Emily Resendiz Mendoza
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame 46556, Indiana, United States
| | - Nosang V Myung
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame 46556, Indiana, United States
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Ali A, Bairagi S, Ganie SA, Ahmed S. Polysaccharides and proteins based bionanocomposites as smart packaging materials: From fabrication to food packaging applications a review. Int J Biol Macromol 2023; 252:126534. [PMID: 37640181 DOI: 10.1016/j.ijbiomac.2023.126534] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 08/08/2023] [Accepted: 08/24/2023] [Indexed: 08/31/2023]
Abstract
Food industry is the biggest and rapidly growing industries all over the world. This sector consumes around 40 % of the total plastic produced worldwide as packaging material. The conventional packaging material is mainly petrochemical based. However, these petrochemical based materials impose serious concerns towards environment after its disposal as they are nondegradable. Thus, in search of an appropriate replacement for conventional plastics, biopolymers such as polysaccharides (starch, cellulose, chitosan, natural gums, etc.), proteins (gelatin, collagen, soy protein, etc.), and fatty acids find as an option but again limited by its inherent properties. Attention on the initiatives towards the development of more sustainable, useful, and biodegradable packaging materials, leading the way towards a new and revolutionary green era in the food sector. Eco-friendly packaging materials are now growing dramatically, at a pace of about 10-20 % annually. The recombination of biopolymers and nanomaterials through intercalation composite technology at the nanoscale demonstrated some mesmerizing characteristics pertaining to both biopolymer and nanomaterials such as rigidity, thermal stability, sensing and bioactive property inherent to nanomaterials as well as biopolymers properties such as flexibility, processability and biodegradability. The dramatic increase of scientific research in the last one decade in the area of bionanocomposites in food packaging had reflected its potential as a much-required and important alternative to conventional petroleum-based material. This review presents a comprehensive overview on the importance and recent advances in the field of bionanocomposite and its application in food packaging. Different methods for the fabrication of bionanocomposite are also discussed briefly. Finally, a clear perspective and future prospects of bionanocomposites in food packaging were presented.
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Affiliation(s)
- Akbar Ali
- Department of Chemistry, Kargil Campus, University of Ladakh, Kargil 194103, India.
| | - Satyaranjan Bairagi
- Materials and Manufacturing Research Group, James Watt School of Engineering, University of Glasgow, Glasgow G128QQ, UK
| | - Showkat Ali Ganie
- State Key Laboratory of Silkworm Genome Biology, Chongqing Engineering Research Centre for Biomaterial Fiber and Modern Textile, College of Sericulture, Textile of Biomass Science, Southwest University, 400715 Chongqing, PR China
| | - Shakeel Ahmed
- Department of Chemistry, Government Degree College Mendhar, Jammu & Kashmir 185211, India; Higher Education Department, Government of Jammu & Kashmir, Jammu 180001, India; University Centre of Research & Development (UCRD), Chandigarh University, Mohali, Punjab 140413, India.
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Xu H, Xu J, Jiang M, Liu M, Tang K, Kan C, Shi D. Exciton-polariton light-emitting diode based on a single ZnO superlattice microwire heterojunction with performance enhanced by Rh nanostructures. Phys Chem Chem Phys 2023; 25:5836-5848. [PMID: 36745472 DOI: 10.1039/d2cp05446a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
One-dimensional (1D) wirelike superlattice micro/nanostructures have received considerable attention for potential applications due to their versatility and capability for modulating optical and electrical characteristics. In this study, 1D superlattice microwires (MWs), which are made of undoped ZnO and Ga-doped ZnO with periodic and alternating crystalline layers (ZnO/ZnO:Ga), were synthesized individually. Under optical excitation, a series of resonance peaks in the photoluminescence spectrum can be ascribed to polariton emission, which originates from the coupling interaction of the 1D photonic crystal and confined excitons along the wire direction. Using a p-type GaN layer as the hole transport layer, a kind of waveguide light source based on an individual ZnO/ZnO:Ga superlattice MW was proposed and constructed. By analysing the spatially resolved electroluminescence spectra, the observed multipeak was ascribed to exciton-polariton emission with a vacuum Rabi splitting of about 275 meV. Cladding with Rh nanostructures gives rise to appropriate ultraviolet plasmons, and the Rabi splitting energy of our device was enhanced up to 413 meV. The exciton-polariton properties were further examined using angle-resolved electroluminescence measurements. Therefore, individual superlattice MWs can act as optical microresonators to achieve photon-exciton coupling with a large Rabi splitting energy. The experimental results indicate that an individual ZnO/ZnO:Ga superlattice MW can be generally used in developing exciton-polariton luminescence/lasing light sources, particularly for constructing low-threshold/thresholdless lasers toward pragmatic applications.
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Affiliation(s)
- Haiying Xu
- College of Physics, MIIT Key Laboratory of Aerospace Information Materials and Physics, Key Laboratory for Intelligent Nano Materials and Devices, Nanjing University of Aeronautics and Astronautics, No. 29 Jiangjun Road, Nanjing 211106, China. .,College of Mathematics and Physics, Nanjing Institute of Technology, Nanjing, 211167, China
| | - Juan Xu
- College of Physics, MIIT Key Laboratory of Aerospace Information Materials and Physics, Key Laboratory for Intelligent Nano Materials and Devices, Nanjing University of Aeronautics and Astronautics, No. 29 Jiangjun Road, Nanjing 211106, China.
| | - Mingming Jiang
- College of Physics, MIIT Key Laboratory of Aerospace Information Materials and Physics, Key Laboratory for Intelligent Nano Materials and Devices, Nanjing University of Aeronautics and Astronautics, No. 29 Jiangjun Road, Nanjing 211106, China.
| | - Maosheng Liu
- College of Physics, MIIT Key Laboratory of Aerospace Information Materials and Physics, Key Laboratory for Intelligent Nano Materials and Devices, Nanjing University of Aeronautics and Astronautics, No. 29 Jiangjun Road, Nanjing 211106, China.
| | - Kai Tang
- College of Physics, MIIT Key Laboratory of Aerospace Information Materials and Physics, Key Laboratory for Intelligent Nano Materials and Devices, Nanjing University of Aeronautics and Astronautics, No. 29 Jiangjun Road, Nanjing 211106, China.
| | - Caixia Kan
- College of Physics, MIIT Key Laboratory of Aerospace Information Materials and Physics, Key Laboratory for Intelligent Nano Materials and Devices, Nanjing University of Aeronautics and Astronautics, No. 29 Jiangjun Road, Nanjing 211106, China.
| | - Daning Shi
- College of Physics, MIIT Key Laboratory of Aerospace Information Materials and Physics, Key Laboratory for Intelligent Nano Materials and Devices, Nanjing University of Aeronautics and Astronautics, No. 29 Jiangjun Road, Nanjing 211106, China.
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Li Y, Yan J, Wang L, Li J, Luo J, Gao JF. Superhydrophobic, electrically conductive and multifunctional polymer foam composite for chemical vapor detection and crude oil cleanup. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127697. [PMID: 34801313 DOI: 10.1016/j.jhazmat.2021.127697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Revised: 10/25/2021] [Accepted: 11/01/2021] [Indexed: 06/13/2023]
Abstract
The leakage of chemicals (either vapors or liquids) severely threatens the environment and even people's health. It remains a great challenge to develop multifunctional and durable materials that can not only detect the chemical vapors but also clean up the liquid chemicals especially high viscous crude oil. Here, a superhydrophobic and conductive foam composite (SCFC) is prepared by decorating carbon black nanoparticles (CBNPs) onto the skeleton of the pre-swollen polymer foam under the assistance of ultrasonication. The CBNPs are firmly embedded onto the skeleton surface, exhibiting a strong interfacial adhesion and hence excellent surface stability and durability. The SCFC possesses stable vapor sensing behavior and can detect various chemical vapors with a low detection limit and good cycling performance. When used for oil/water separation, the SCFC has large oil adsorption capacity for different oils with excellent reusability. Also, the outstanding photo-thermal conversion performance of the SCFC can be used to significantly reduce the oil viscosity and hence realize efficient cleanup of the crude oil. The multifunctional SCFC has promising applications in the field of environment protection, flexible electronics, etc.
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Affiliation(s)
- Yiyao Li
- School of Chemistry and Chemical Engineering, Yangzhou University, No 180, Road Siwangting, Yangzhou, Jiangsu 225002, China
| | - Jun Yan
- School of Chemistry and Chemical Engineering, Yangzhou University, No 180, Road Siwangting, Yangzhou, Jiangsu 225002, China
| | - Ling Wang
- School of Chemistry and Chemical Engineering, Yangzhou University, No 180, Road Siwangting, Yangzhou, Jiangsu 225002, China
| | - Juntao Li
- School of Chemistry and Chemical Engineering, Yangzhou University, No 180, Road Siwangting, Yangzhou, Jiangsu 225002, China
| | - Junchen Luo
- School of Chemistry and Chemical Engineering, Yangzhou University, No 180, Road Siwangting, Yangzhou, Jiangsu 225002, China
| | - Jie-Feng Gao
- School of Chemistry and Chemical Engineering, Yangzhou University, No 180, Road Siwangting, Yangzhou, Jiangsu 225002, China; State Key Laboratory of Polymer Materials Engineering, Sichuan University, No. 24, South Section 1, First Ring Road, Chengdu, Sichuan 610065, China; Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Building 22, Qinyuan, No. 2318, Yuhangtang Road, Cangqian Street, Yuhang District, Hangzhou 311121, China.
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Skowronski L, Trzcinski M, Olszewska A, Szczesny R. Microstructure and Optical Properties of Nanostructural Thin Films Fabricated through Oxidation of Au-Sn Intermetallic Compounds. MATERIALS 2021; 14:ma14144034. [PMID: 34300953 PMCID: PMC8307610 DOI: 10.3390/ma14144034] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 07/09/2021] [Accepted: 07/16/2021] [Indexed: 11/16/2022]
Abstract
AuSn and AuSn2 thin films (5 nm) were used as precursors during the formation of semiconducting metal oxide nanostructures on a silicon substrate. The nanoparticles were produced in the processes of annealing and oxidation of gold–tin intermetallic compounds under ultra-high vacuum conditions. The formation process and morphology of a mixture of SnO2 and Au@SnOx (the core–shell structure) nanoparticles or Au nanocrystalites were carefully examined by means of spectroscopic ellipsometry (SE), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) combined with energy-dispersive X-ray spectroscopy (EDX). The annealing and oxidation of the thin film of the AuSn intermetallic compound led to the formation of uniformly distributed structures with a size of ∼20–30 nm. All of the synthesized nanoparticles exhibited a strong absorption band at 520–530 nm, which is typical for pure metallic or metal oxide systems.
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Affiliation(s)
- Lukasz Skowronski
- Institute of Mathematics and Physics, UTP University of Science and Technology, Kaliskiego 7, 85-796 Bydgoszcz, Poland; (M.T.); (A.O.)
- Correspondence:
| | - Marek Trzcinski
- Institute of Mathematics and Physics, UTP University of Science and Technology, Kaliskiego 7, 85-796 Bydgoszcz, Poland; (M.T.); (A.O.)
| | - Aleksandra Olszewska
- Institute of Mathematics and Physics, UTP University of Science and Technology, Kaliskiego 7, 85-796 Bydgoszcz, Poland; (M.T.); (A.O.)
| | - Robert Szczesny
- Faculty of Chemistry, Nicolaus Copernicus University in Torun, Gagarina 7, 87-100 Torun, Poland;
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Moumen A, Kaur N, Poli N, Zappa D, Comini E. One Dimensional ZnO Nanostructures: Growth and Chemical Sensing Performances. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1940. [PMID: 33003427 PMCID: PMC7599835 DOI: 10.3390/nano10101940] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 09/23/2020] [Accepted: 09/25/2020] [Indexed: 02/04/2023]
Abstract
Recently, one-dimensional (1D) nanostructures have attracted the scientific community attention as sensitive materials for conductometric chemical sensors. However, finding facile and low-cost techniques for their production, controlling the morphology and the aspect ratio of these nanostructures is still challenging. In this study, we report the vapor-liquid-solid (VLS) synthesis of one dimensional (1D) zinc oxide (ZnO) nanorods (NRs) and nanowires (NWs) by using different metal catalysts and their impact on the performances of conductometric chemical sensors. In VLS mechanism, catalysts are of great interest due to their role in the nucleation and the crystallization of 1D nanostructures. Here, Au, Pt, Ag and Cu nanoparticles (NPs) were used to grow 1D ZnO. Depending on catalyst nature, different morphology, geometry, size and nanowires/nanorods abundance were established. The mechanism leading to the VLS growth of 1D ZnO nanostructures and the transition from nanorods to nanowires have been interpreted. The formation of ZnO crystals exhibiting a hexagonal crystal structure was confirmed by X-ray diffraction (XRD) and ZnO composition was identified using transmission electron microscopy (TEM) mapping. The chemical sensing characteristics showed that 1D ZnO has good and fast response, good stability and selectivity. ZnO (Au) showed the best performances towards hydrogen (H2). At the optimal working temperature of 350 °C, the measured response towards 500 ppm of H2 was 300 for ZnO NWs and 50 for ZnO NRs. Moreover, a good selectivity to hydrogen was demonstrated over CO, acetone and ethanol.
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Affiliation(s)
| | | | | | | | - Elisabetta Comini
- Sensor Lab, Department of Information Engineering, University of Brescia, 25123 Brescia, Italy; (A.M.); (N.K.); (N.P.); (D.Z.)
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Munasinghe Arachchige HMM, Zappa D, Poli N, Gunawardhana N, Attanayake NH, Comini E. Seed-Assisted Growth of TiO 2 Nanowires by Thermal Oxidation for Chemical Gas Sensing. NANOMATERIALS 2020; 10:nano10050935. [PMID: 32413953 PMCID: PMC7279288 DOI: 10.3390/nano10050935] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 05/03/2020] [Accepted: 05/04/2020] [Indexed: 01/06/2023]
Abstract
Herein, we report the catalyst assisted growth of TiO2 one-dimensional (1D) nanowires (NWs) on alumina substrates by the thermal oxidation technique. RF magnetron sputtering was used to deposit a thin Ti metallic layer on the alumina substrate, followed by an Au catalytic layer on the Ti metallic one. Thermal oxidation was carried out in an oxygen deficient environment. The optimal thermal growth temperature was 700 °C, in a mixture environment composed by Ar and O2. As a comparison, Ti films were also oxidized without the presence of the Au catalyst. However, without the Au catalyst, no growth of nanowires was observed. Furthermore, the effect of the oxidation temperature and the film thickness were also investigated. SEM, TEM, and EDX studies demonstrated the presence of Au nanoparticles on top of the NWs, indicating that the Au catalyst drove the growth process. Raman spectroscopy revealed the Rutile crystalline phase of TiO2 NWs. Gas testing measurements were carried out in the presence of a relative humidity of 40%, showing a reversible response to ethanol and H2 at various concentrations. Thanks to the moderate temperature and the easiness of the process, the presented synthesis technique is suitable to grow TiO2 NWs for many different applications.
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Affiliation(s)
- Hashitha M. M. Munasinghe Arachchige
- SENSOR Laboratory, University of Brescia, Via D. Valotti 9, 25133 Brescia, Italy; (D.Z.); (N.P.); (E.C.)
- Centre for Research and International Relations, Sri Lanka Technological Campus, Padukka 10500, Sri Lanka;
- Correspondence:
| | - Dario Zappa
- SENSOR Laboratory, University of Brescia, Via D. Valotti 9, 25133 Brescia, Italy; (D.Z.); (N.P.); (E.C.)
| | - Nicola Poli
- SENSOR Laboratory, University of Brescia, Via D. Valotti 9, 25133 Brescia, Italy; (D.Z.); (N.P.); (E.C.)
| | - Nanda Gunawardhana
- Centre for Research and International Relations, Sri Lanka Technological Campus, Padukka 10500, Sri Lanka;
| | - Nuwan H. Attanayake
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, PA 19122, USA;
| | - Elisabetta Comini
- SENSOR Laboratory, University of Brescia, Via D. Valotti 9, 25133 Brescia, Italy; (D.Z.); (N.P.); (E.C.)
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IoT-Enabled Gas Sensors: Technologies, Applications, and Opportunities. JOURNAL OF SENSOR AND ACTUATOR NETWORKS 2019. [DOI: 10.3390/jsan8040057] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Ambient gas detection and measurement had become essential in diverse fields and applications, from preventing accidents, avoiding equipment malfunction, to air pollution warnings and granting the correct gas mixture to patients in hospitals. Gas leakage can reach large proportions, affecting entire neighborhoods or even cities, causing enormous environmental impacts. This paper elaborates on a deep review of the state of the art on gas-sensing technologies, analyzing the opportunities and main characteristics of the transducers, as well as towards their integration through the Internet of Things (IoT) paradigm. This should ease the information collecting and sharing processes, granting better experiences to users, and avoiding major losses and expenses. The most promising wireless-based solutions for ambient gas monitoring are analyzed and discussed, open research topics are identified, and lessons learned are shared to conclude the study.
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Wang C, Hosomi T, Nagashima K, Takahashi T, Zhang G, Kanai M, Zeng H, Mizukami W, Shioya N, Shimoaka T, Tamaoka T, Yoshida H, Takeda S, Yasui T, Baba Y, Aoki Y, Terao J, Hasegawa T, Yanagida T. Rational Method of Monitoring Molecular Transformations on Metal-Oxide Nanowire Surfaces. NANO LETTERS 2019; 19:2443-2449. [PMID: 30888179 DOI: 10.1021/acs.nanolett.8b05180] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Metal-oxide nanowires have demonstrated excellent capability in the electrical detection of various molecules based on their material robustness in liquid and air environments. Although the surface structure of the nanowires essentially determines their interaction with adsorbed molecules, understanding the correlation between an oxide nanowire surface and an adsorbed molecule is still a major challenge. Herein, we propose a rational methodology to obtain this information for low-density molecules adsorbed on metal oxide nanowire surfaces by employing infrared p-polarized multiple-angle incidence resolution spectroscopy and temperature-programmed desorption/gas chromatography-mass spectrometry. As a model system, we studied the surface chemical transformation of an aldehyde (nonanal, a cancer biomarker in breath) on single-crystalline ZnO nanowires. We found that a slight surface reconstruction, induced by the thermal pretreatment, determines the surface chemical reactivity of nonanal. The present results show that the observed surface reaction trend can be interpreted in terms of the density of Zn ions exposed on the nanowire surface and of their corresponding spatial arrangement on the surface, which promotes the reaction between neighboring adsorbed molecules. The proposed methodology will support a better understanding of complex molecular transformations on various nanostructured metal-oxide surfaces.
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Affiliation(s)
- Chen Wang
- Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Takuro Hosomi
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Kazuki Nagashima
- Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Tsunaki Takahashi
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Guozhu Zhang
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Masaki Kanai
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Hao Zeng
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Wataru Mizukami
- Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Nobutaka Shioya
- Division of Environmental Chemistry , Institute for Chemical Research, Kyoto University , Gokasho, Uji , Kyoto 611-0011 , Japan
| | - Takafumi Shimoaka
- Division of Environmental Chemistry , Institute for Chemical Research, Kyoto University , Gokasho, Uji , Kyoto 611-0011 , Japan
| | - Takehiro Tamaoka
- The Institute of Scientific and Industrial Research, Osaka University , 8-1 Mihogaoka , Ibaraki , Osaka 567-0047 , Japan
| | - Hideto Yoshida
- The Institute of Scientific and Industrial Research, Osaka University , 8-1 Mihogaoka , Ibaraki , Osaka 567-0047 , Japan
| | - Seiji Takeda
- The Institute of Scientific and Industrial Research, Osaka University , 8-1 Mihogaoka , Ibaraki , Osaka 567-0047 , Japan
| | - Takao Yasui
- Department of Biomolecular Engineering, School of Engineering , Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8603 , Japan
| | - Yoshinobu Baba
- Department of Biomolecular Engineering, School of Engineering , Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8603 , Japan
| | - Yuriko Aoki
- Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Jun Terao
- Department of Basic Science, Graduate School of Arts and Sciences , The University of Tokyo , Meguro-ku, Tokyo 153-8902 , Japan
| | - Takeshi Hasegawa
- Division of Environmental Chemistry , Institute for Chemical Research, Kyoto University , Gokasho, Uji , Kyoto 611-0011 , Japan
| | - Takeshi Yanagida
- Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
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Sensitivity-Selectivity Trade-Offs in Surface Ionization Gas Detection. NANOMATERIALS 2018; 8:nano8121017. [PMID: 30563261 PMCID: PMC6316693 DOI: 10.3390/nano8121017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 11/29/2018] [Indexed: 01/21/2023]
Abstract
Surface ionization (SI) provides a simple, sensitive, and selective method for the detection of high-proton affinity substances, such as organic decay products, medical and illicit drugs as well as a range of other hazardous materials. Tests on different kinds of SI sensors showed that the sensitivity and selectivity of such devices is not only dependent on the stoichiometry and nanomorphology of the emitter materials, but also on the shape of the electrode configurations that are used to read out the SI signals. Whereas, in parallel-plate capacitor devices, different kinds of emitter materials exhibit a high level of amine-selectivity, MEMS (micro-electro-mechanical-systems) and NEMS (nanowire) versions of SI sensors employing the same kinds of emitter materials provide significantly higher sensitivity, however, at the expense of a reduced chemical selectivity. In this paper, it is argued that such sensitivity-selectivity trade-offs arise from unselective physical ionization phenomena that occur in the high-field regions immediately adjacent to the surfaces of sharply curved MEMS (NEMS) emitter and collector electrodes.
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Abstract
In this work, the latest achievements in the field of copper oxide thin film gas sensors are presented and discussed. Several methods and deposition techniques are shown with their advantages and disadvantages for commercial applications. Recently, CuO thin film gas sensors have been studied to detect various compounds, such as: nitrogen oxides, carbon oxides, hydrogen sulfide, ammonia, as well as several volatile organic compounds in many different applications, e.g., agriculture. The CuO thin film gas sensors exhibited high 3-S parameters (sensitivity, selectivity, and stability). Furthermore, the possibility to function at room temperature with long-term stability was proven as well, which makes this material very attractive in gas-sensing applications, including exhaled breath analysis.
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