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Zhang K, Qin S, Tang P, Feng Y, Li D. Ultra-sensitive ethanol gas sensors based on nanosheet-assembled hierarchical ZnO-In 2O 3 heterostructures. JOURNAL OF HAZARDOUS MATERIALS 2020; 391:122191. [PMID: 32044631 DOI: 10.1016/j.jhazmat.2020.122191] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 01/23/2020] [Accepted: 01/24/2020] [Indexed: 05/21/2023]
Abstract
Developing efficient sensing materials with super sensitivity and selectivity is imperative to fabricate high-performance gas sensors for satisfying future needs. Herein, we report the preparation of ultrathin nanosheet-assembled 3D hierarchical ZnO/In2O3 heterostructures for the sensitive and selective detection of ethanol by sintering the 3D hierarchical Zn/In glycerolate precursors consisting of ultrathin nanosheets synthesized through a facile solvothermal method. The obtained ZnO/In2O3 heterostructures were carefully characterized by XRD, SEM, HRTEM, BET and XPS. The results showed that the 20%ZnO/In2O3 heterostructure is built up by many ultrathin nanosheets composed of intimately connected ZnO and In2O3 nanoparticles and have a specific surface area as high as 137.1 m2 g-1. Because of the unique hierarchical structure, abundant mesoporous and formation of ZnO-In2O3 n-n heterojunctions, the 20%ZnO/In2O3 heterostructure based sensor was ultra-sensitive to ethanol gas at 240 °C and exhibited a response as high as 170 toward 50 ppm of ethanol, which is about 3.3 times higher than that of pure In2O3 based sensor. Moreover, the sensor based on 20%ZnO/In2O3 heterostructure has virtues of excellent selectivity, good long-term stability and moderate response and recovery speed (35/46 s) toward ethanol. Therefore, the ultrathin nanosheet-assembled 3D hierarchical heterostructures are promising materials for fabricating high-performance gas sensors.
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Affiliation(s)
- Kun Zhang
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Shuaiwei Qin
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Pinggui Tang
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing, 100029, PR China.
| | - Yongjun Feng
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Dianqing Li
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing, 100029, PR China.
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Zhang D, Chen M, Zou H, Zhang Y, Hu J, Wang H, Zi B, Zhang J, Zhu Z, Duan L, Liu Q. Microwave-assisted synthesis of porous and hollow α-Fe 2O 3/LaFeO 3 nanostructures for acetone gas sensing as well as photocatalytic degradation of methylene blue. NANOTECHNOLOGY 2020; 31:215601. [PMID: 32032011 DOI: 10.1088/1361-6528/ab73b5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
To address the urgent issues of hazardous gas detection and the prevention of environmental pollution, various functional materials for gas sensing and catalytic reduction have been studied. Specifically, the p-type perovskite LaFeO3 has been studied widely because of its promising physicochemical properties. However, there remains several problems to develop a controllable synthesis of LaFeO3-based p-n heterojunctions. In this work, α-Fe2O3 was further compounded with LaFeO3 to form a porous and hollow α-Fe2O3/LaFeO3 heterojunction to improve its gas-sensing performance and photocatalytic efficiency via a microwave-assisted hydrothermal method. While evaluated as sensors of acetone gas, the optimized sample exhibits excellent performance, including a high response (48.3), excellent selectivity, good reversibility, fast response, and recovery ability. Furthermore, it is an efficient catalyst for the degradation of methylene blue. This can be attributed to the enhancement effect of its larger specific surface area, fast diffusion, enhanced surface activities, and p-n heterojunction. Additionally, this work provides a rapid and rational synthesis strategy to produce metal oxides with both enhanced gas-sensing performance and improved photocatalytic properties.
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Affiliation(s)
- Dongming Zhang
- School of Materials Science and Engineering, Yunnan Key Laboratory for Micro/nano Materials & Technology, Yunnan University, Kunming 650091, People's Republic of China
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Zeng X, Liu L, Lv Y, Zhao B, Ju X, Xu S, Zhang J, Tian C, Sun D, Tang X. Ultra-sensitive and fast response formaldehyde sensor based on La2O3-In2O3 beaded nanotubes at low temperature. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137289] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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54
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Zhou L, Qian R, Zhuo S, Chen Q, Wen Z, Li G. Oximation reaction induced reduced graphene oxide gas sensor for formaldehyde detection. JOURNAL OF SAUDI CHEMICAL SOCIETY 2020. [DOI: 10.1016/j.jscs.2020.02.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Xu D, Xu P, Wang X, Chen Y, Yu H, Zheng D, Li X. Pentagram-Shaped Ag@Pt Core-Shell Nanostructures as High-Performance Catalysts for Formaldehyde Detection. ACS APPLIED MATERIALS & INTERFACES 2020; 12:8091-8097. [PMID: 31967775 DOI: 10.1021/acsami.9b17201] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
High-performance HCHO sensors are of great importance in various application fields such as indoor air quality assessments. Herein, bimetallic Ag-Pt nanoparticles are synthesized as high-performance catalysts for ZnO-based gas sensors. Spherical aberration (Cs)-corrected transmission electron microscopy images with atomic resolution clearly indicate that the prepared nanoparticles exhibit a novel Ag@Pt core-shell nanostructure with a pentagram shape. For high-performance HCHO sensor construction, integrated micro-electrodes are first fabricated with the microelectromechanical system (MEMS) technology. Then, the hydrothermal route is used to self-assemble well-aligned ZnO nanowire arrays onto the sensing microregion. After that, the pentagram-shaped Ag@Pt nanoparticles are loaded onto the surface of ZnO nanowires with the inkjet printing technique to form MEMS sensors with Ag@Pt@ZnO as the sensing material. The thoroughly sensing experiments indicate that the Ag@Pt nanoparticles exhibit satisfied catalytic activation to HCHO molecules. The experimental observed detection limit of our sensor to HCHO reaches the parts per billion level. To elucidate the HCHO-sensing mechanism, the online mass spectrum (online MS) is utilized to analyze the components of exhaust gas stream of HCHO flowing through the Ag@Pt@ZnO material. The online MS indicates that with the Ag@Pt catalyst, HCHO molecules are partially oxidized to HCOOH molecules at low temperatures and are completely oxidized to CO2 molecules at high temperatures.
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Affiliation(s)
- Dongsheng Xu
- School of Chemical and Environmental Engineering , Shanghai Institute of Technology , 100 Haiquan Road , Shanghai 201418 , China
- State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology , Chinese Academy of Sciences , 865 Changning Road , Shanghai 200050 , China
| | - Pengcheng Xu
- State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology , Chinese Academy of Sciences , 865 Changning Road , Shanghai 200050 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Xueqing Wang
- State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology , Chinese Academy of Sciences , 865 Changning Road , Shanghai 200050 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Ying Chen
- State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology , Chinese Academy of Sciences , 865 Changning Road , Shanghai 200050 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Haitao Yu
- State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology , Chinese Academy of Sciences , 865 Changning Road , Shanghai 200050 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Dan Zheng
- School of Chemical and Environmental Engineering , Shanghai Institute of Technology , 100 Haiquan Road , Shanghai 201418 , China
| | - Xinxin Li
- State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology , Chinese Academy of Sciences , 865 Changning Road , Shanghai 200050 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
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56
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Song L, Dou K, Wang R, Leng P, Luo L, Xi Y, Kaun CC, Han N, Wang F, Chen Y. Sr-Doped Cubic In 2O 3/Rhombohedral In 2O 3 Homojunction Nanowires for Highly Sensitive and Selective Breath Ethanol Sensing: Experiment and DFT Simulation Studies. ACS APPLIED MATERIALS & INTERFACES 2020; 12:1270-1279. [PMID: 31822058 DOI: 10.1021/acsami.9b15928] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In recent years, it is urgent and challenging to fabricate highly sensitive and selective gas sensors for breath analyses. In this work, Sr-doped cubic In2O3/rhombohedral In2O3 homojunction nanowires (NWs) are synthesized by one-step electrospun technology. The Sr doping alters the cubic phase of pure In2O3 into the rhombohedral phase, which is verified by the high-resolution transmittance electron microscopy, X-ray diffraction, and Raman spectroscopy, and is attributable to the low cohesive energy as calculated by the density functional theory (DFT). As a proof-of-concept of fatty liver biomarker sensing, ethanol sensors are fabricated using the electrospun In2O3 NWs. The results show that 8 wt % Sr-doped In2O3 shows the highest ethanol sensing performance with a high response of 21-1 ppm, a high selectivity over other interfering gases such as methanol, acetone, formaldehyde, toluene, xylene, and benzene, a high stability measured in 6 weeks, and also a high resistance to high humidity of 80%. The outstanding ethanol sensing performance is attributable to the enhanced ethanol adsorption by Sr doping as calculated by DFT, the stable rhombohedral phase and the preferred (104) facet exposure, and the formed homojunctions favoring the electron transfer. All these results show the effective structural modification of In2O3 by Sr doping, and also the great potency of the homojunction Sr-doped In2O3 NWs for highly sensitive, selective, and stable breath ethanol sensing.
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Affiliation(s)
- Longfei Song
- College of Physics and Cultivation Base for State Key Laboratory , Qingdao University , Qingdao 266071 , China
- State Key Laboratory of Multiphase Complex Systems , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , China
| | - Kunpeng Dou
- College of Information Science and Engineering , Ocean University of China , Qingdao 266100 , China
| | - Rongrong Wang
- Department of Pharmacy , The Affiliated Hospital of Qingdao University , Qingdao 266003 , China
| | - Ping Leng
- Department of Pharmacy , The Affiliated Hospital of Qingdao University , Qingdao 266003 , China
| | - Linqu Luo
- College of Physics and Cultivation Base for State Key Laboratory , Qingdao University , Qingdao 266071 , China
| | - Yan Xi
- College of Physics and Cultivation Base for State Key Laboratory , Qingdao University , Qingdao 266071 , China
| | - Chao-Cheng Kaun
- Research Center for Applied Sciences , Academia Sinica , Taipei 11529 , Taiwan
| | - Ning Han
- State Key Laboratory of Multiphase Complex Systems , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , China
| | - Fengyun Wang
- College of Physics and Cultivation Base for State Key Laboratory , Qingdao University , Qingdao 266071 , China
| | - Yunfa Chen
- State Key Laboratory of Multiphase Complex Systems , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , China
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57
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Temel F. One novel calix[4]arene based QCM sensor for sensitive, selective and high performance-sensing of formaldehyde at room temperature. Talanta 2020; 211:120725. [PMID: 32070583 DOI: 10.1016/j.talanta.2020.120725] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 01/03/2020] [Accepted: 01/07/2020] [Indexed: 12/14/2022]
Abstract
This work designs the synthesis of a novel amino morpholine schiff base functionalized calix[4]arene cage (SCC), its deposition onto Quartz Crystal Microbalance (QCM) crystal surface, and usage for the selective detecting of formaldehyde (HCHO). The SCC modified QCM sensor has been characterized by contact angle measurements and microscopy images. Initial experiments revealed that the frequency response decreased significantly which means that there was a good interaction between the SCC molecules and HCHO. The proposed sensor exhibited a linear response towards HCHO in different concentrations ranging from 1.85 to 9.25 ppm, having the high sensitivity (S) and low limit of detection (LOD) being 18.324 Hz/ppm and 0.67 ppm, respectively. Furthermore, the adsorption behavior and mechanism of HCHO onto the QCM sensor were investigated for this sensing system and the adsorption data exhibited a good correlation with the Freundlich and Langmuir-Freundlich adsorption models in terms of the regression coefficient. The QCM sensor showed outstanding selective performance to HCHO among %97 RH and some a number of interfering volatile organic compounds (VOCs) such as chloroform, dichloromethane, acetone, n-hexane, methanol, xylene, and ammonia. Thus, real-time, sensitive, selective and effective recognition of HCHO by the sensor can be explained some adsorption mechanisms such as size-fit concept, three-dimensional structures of molecules and interaction between moieties of the sensible film layer and analyte molecules such as hydrogen bonding interactions.
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Affiliation(s)
- Farabi Temel
- Konya Technical University, Department of Chemical Engineering, 42130, Konya, Turkey.
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58
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Zhou S, Chen M, Lu Q, Zhang Y, Zhang J, Li B, Wei H, Hu J, Wang H, Liu Q. Ag Nanoparticles Sensitized In 2O 3 Nanograin for the Ultrasensitive HCHO Detection at Room Temperature. NANOSCALE RESEARCH LETTERS 2019; 14:365. [PMID: 31807936 PMCID: PMC6895329 DOI: 10.1186/s11671-019-3213-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 11/15/2019] [Indexed: 05/03/2023]
Abstract
Formaldehyde (HCHO) is the main source of indoor air pollutant. HCHO sensors are therefore of paramount importance for timely detection in daily life. However, existing sensors do not meet the stringent performance targets, while deactivation due to sensing detection at room temperature, for example, at extremely low concentration of formaldehyde (especially lower than 0.08 ppm), is a widely unsolved problem. Herein, we present the Ag nanoparticles (Ag NPs) sensitized dispersed In2O3 nanograin via a low-fabrication-cost hydrothermal strategy, where the Ag NPs reduces the apparent activation energy for HCHO transporting into and out of the In2O3 nanoparticles, while low concentrations detection at low working temperature is realized. The pristine In2O3 exhibits a sluggish response (Ra/Rg = 4.14 to 10 ppm) with incomplete recovery to HCHO gas. After Ag functionalization, the 5%Ag-In2O3 sensor shows a dramatically enhanced response (135) with a short response time (102 s) and recovery time (157 s) to 1 ppm HCHO gas at 30 °C, which benefits from the Ag NPs that electronically and chemically sensitize the crystal In2O3 nanograin, greatly enhancing the selectivity and sensitivity.
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Affiliation(s)
- Shiqiang Zhou
- School of Materials Science and Engineering, Yunnan Key Laboratory for Micro/nano Materials & Technology, Yunnan University, Kunming, 650091, China
| | - Mingpeng Chen
- Institute of Applied Physics and Materials Engineering, University of Macau, Macau SAR, China
| | - Qingjie Lu
- School of Materials Science and Engineering, Yunnan Key Laboratory for Micro/nano Materials & Technology, Yunnan University, Kunming, 650091, China
| | - Yumin Zhang
- School of Materials Science and Engineering, Yunnan Key Laboratory for Micro/nano Materials & Technology, Yunnan University, Kunming, 650091, China
| | - Jin Zhang
- School of Materials Science and Engineering, Yunnan Key Laboratory for Micro/nano Materials & Technology, Yunnan University, Kunming, 650091, China
| | - Bo Li
- School of Materials Science and Engineering, Yunnan Key Laboratory for Micro/nano Materials & Technology, Yunnan University, Kunming, 650091, China
| | - Haitang Wei
- School of Materials Science and Engineering, Yunnan Key Laboratory for Micro/nano Materials & Technology, Yunnan University, Kunming, 650091, China
| | - Jicu Hu
- School of Materials Science and Engineering, Yunnan Key Laboratory for Micro/nano Materials & Technology, Yunnan University, Kunming, 650091, China
| | - Huapeng Wang
- School of Materials Science and Engineering, Yunnan Key Laboratory for Micro/nano Materials & Technology, Yunnan University, Kunming, 650091, China
| | - Qingju Liu
- School of Materials Science and Engineering, Yunnan Key Laboratory for Micro/nano Materials & Technology, Yunnan University, Kunming, 650091, China.
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Abstract
Volatile organic compounds (VOCs) are among the most abundant air pollutants. Their high concentrations can adversely affect the human body, and therefore, early detection of VOCs is of outmost importance. Among the different VOCs, in this review paper we have focused our attention to the monitoring of acetaldehyde by chemiresistive gas sensors fabricated from nanostructured semiconducting metal oxides. These sensors can not only provide a high sensing signal for detection of acetaldehyde but also high thermal and mechanical stability along with a low price. This review paper is divided into three major sections. First, we will introduce acetaldehyde as an important VOC and the importance of its detection. Then, the fundamentals of chemiresistive gas sensors will be briefly presented, and in the last section, a survey of the literature on acetaldehyde gas sensors will be presented. The working mechanism of acetaldehyde sensors, their structures, and configurations are reviewed. Finally, the future development outlook and potential applications are discussed, giving a complete panoramic view for researchers working and interested in acetaldehyde detection for different purposes in many fundamental and applicative fields.
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60
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Jeevitha G, Abhinayaa R, Mangalaraj D, Ponpandian N, Meena P, Mounasamy V, Madanagurusamy S. Porous reduced graphene oxide (rGO)/WO 3 nanocomposites for the enhanced detection of NH 3 at room temperature. NANOSCALE ADVANCES 2019; 1:1799-1811. [PMID: 36134232 PMCID: PMC9418995 DOI: 10.1039/c9na00048h] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 02/27/2019] [Indexed: 05/12/2023]
Abstract
Incorporation of reduced graphene oxide (rGO) modifies the properties of semiconducting metal oxide nanoparticles and makes it possible to tune the surface area and pore size to optimum values, which in turn improves their gas sensing properties. In this work, to improve the ammonia (NH3) gas sensing characteristics, reduced graphene oxide (rGO) was incorporated into tungsten oxide (WO3) nanospheres using a simple ultrasonication method. The rGO-WO3 nanocomposites exhibited porous nanosheets with nanospherical WO3 as observed with field-emission scanning electron microscopy (FE-SEM). The oxidation state of the rGO-WO3 nanocomposite was determined using X-ray photoelectron spectroscopy (XPS). Three ratios of (1, 5 and 10% rGO/WO3) nanocomposites and pure WO3 showed good selectivity towards NH3 at 10-100 ppm, and more remarkably at room temperature in the range of about 32-35 °C and at a relative humidity (RH) of 55%. The limit of detection (LOD) of the synthesized rGO-WO3 nanocomposites was 1.14 ppm, which will highly favour low detection ranges of NH3. The sensor response was 1.5 times higher than that of the bare WO3 nanospheres. The sensors showed excellent selectivity, ultrafast response/recovery times (18/24 s), reproducibility and stability even after one month of their preparation. We believe that metal oxides using the rGO modifier can improve the sensitivity and reduce the LOD towards NH3 and can be used effectively in real-time environmental monitoring.
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Affiliation(s)
- G Jeevitha
- Department of Nanoscience and Technology, Bharathiar University Coimbatore 641 046 India
| | - R Abhinayaa
- Department of Nanoscience and Technology, Bharathiar University Coimbatore 641 046 India
| | - D Mangalaraj
- Department of Nanoscience and Technology, Bharathiar University Coimbatore 641 046 India
| | - N Ponpandian
- Department of Nanoscience and Technology, Bharathiar University Coimbatore 641 046 India
| | - P Meena
- Department of Physics, PSGR Krishnammal College for Women Coimbatore 641 004 India
| | - Veena Mounasamy
- Functional Nanomaterials & Devices Laboratory, Centre for Nanotechnology and Advanced Biomaterials, School of Electrical & Electronics Engineering, Shanmugha Arts, Science, Technology and Research Academy (SASTRA) Thanjavur-613 401 India
| | - Sridharan Madanagurusamy
- Functional Nanomaterials & Devices Laboratory, Centre for Nanotechnology and Advanced Biomaterials, School of Electrical & Electronics Engineering, Shanmugha Arts, Science, Technology and Research Academy (SASTRA) Thanjavur-613 401 India
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A Capacitive Micromachined Ultrasonic Transducer-Based Resonant Sensor Array for Portable Volatile Organic Compound Detection with Wireless Systems. SENSORS 2019; 19:s19061401. [PMID: 30901963 PMCID: PMC6470568 DOI: 10.3390/s19061401] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 03/13/2019] [Accepted: 03/18/2019] [Indexed: 12/20/2022]
Abstract
The development of portable volatile organic compound (VOC) sensors is essential for home healthcare and workplace safety because VOCs are environmental pollutants that may critically affect human health. Here, we report a compact and portable sensor platform based on a capacitive micromachined ultrasonic transducer (CMUT) array offering multiplex detection of various VOCs (toluene, acetone, ethanol, and methanol) using a single read-out system. Three CMUT resonant devices were functionalized with three different layers: (1) phenyl-selective peptide, (2) colloids of single-walled nanotubes and peptide, and (3) poly(styrene-co-allyl alcohol). As each device exhibited different sensitivities to the four VOCs, we performed principal component analysis to achieve selective detection of all four gases. For the simultaneous detection of VOCs using CMUT sensors, the changes in the resonant frequencies of three devices were monitored in real time, but using only a single oscillator through an electrically controlled relay to achieve compactness. In addition, by devising a wireless system, measurement results were transmitted to a smartphone to monitor the concentration of VOCs. We used multiple sensors to obtain a larger number of fingerprints for pattern recognition to enhance selectivity but interfaced these sensors with a single read-out circuit to minimize the footprint of the overall system. The compact CMUT-based sensor array based on a multiplex detection scheme is a promising sensor platform for portable VOC monitoring.
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Wu J, Yang Y, Zhang C, Yu H, Huang L, Dong X, Wang J, Wang X. Extremely sensitive and accurate H2S sensor at room temperature fabricated with In-doped Co3O4 porous nanosheets. Dalton Trans 2019; 48:7720-7727. [DOI: 10.1039/c9dt01043b] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In-Doped Co3O4 porous nanosheets were synthesized and exhibited a fast response and high selectivity towards H2S at room temperature.
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Affiliation(s)
- Jie Wu
- Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Ying Yang
- Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Chengxin Zhang
- Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Hui Yu
- Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Licheng Huang
- Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Xiangting Dong
- Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Jinxian Wang
- Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province
- Changchun University of Science and Technology
- Changchun 130022
- China
| | - Xinlu Wang
- Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province
- Changchun University of Science and Technology
- Changchun 130022
- China
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63
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Zhu Q, Wang H, Yang J, Xie C, Zeng D, Zhao N. Red Phosphorus: An Elementary Semiconductor for Room-Temperature NO 2 Gas Sensing. ACS Sens 2018; 3:2629-2636. [PMID: 30456951 DOI: 10.1021/acssensors.8b01041] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Black and blue phosphorus (both allotropes of elementary phosphorus) have recently been widely explored as an active material for electronic devices, and their potential in gas sensing applications has been demonstrated. On the other hand, amorphous red phosphorus (a-RP), a much cheaper and readily available phosphorus allotrope, has seldom been investigated as an electronic material, and its gas sensing properties have never been studied. In this work we have investigated these properties of a-RP by combining experimental characterizations with theoretical calculations. We found that a-RP exhibited an amphoteric character for detecting both commonly regarded reducing and oxidizing gas molecules, featuring a negative correlation between the electrical resistance of a-RP and the gas concentration. Interestingly, the a-RP based sensors appear to be particularly suitable for room-temperature NO2 detection, exhibiting excellent sensitivity and selectivity, as well as fast temporal response and recovery. A unique sensing feature of a-RP toward NO2 was identified, which is associated with the expansion of P-P bonds upon NO2 chemisorption. Based on density functional theory calculations we proposed a physiochemical model to elaborate the synergistic effects of the P-P bond expansion and Langmuir isotherm adsorption on the electronic properties and gas sensing processes of a-RP.
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Affiliation(s)
- Qiang Zhu
- Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
| | - Hao Wang
- State Key Laboratory of Material Processing and Die & Mould Technology, Department of Materials Science and Engineering, Huazhong University of Science and Technology, Luoyu Road, Wuhan, 430074, China
| | - Jun Yang
- Department of Chemistry, University of Hong Kong, Pokfulam Road, Pokfulam, Hong Kong SAR, China
| | - Changsheng Xie
- State Key Laboratory of Material Processing and Die & Mould Technology, Department of Materials Science and Engineering, Huazhong University of Science and Technology, Luoyu Road, Wuhan, 430074, China
| | - Dawen Zeng
- State Key Laboratory of Material Processing and Die & Mould Technology, Department of Materials Science and Engineering, Huazhong University of Science and Technology, Luoyu Road, Wuhan, 430074, China
| | - Ni Zhao
- Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
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64
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Wei D, Xie J, Tong DG. Amorphous Europium Hexaboride: A Potential Room Temperature Formaldehyde Sensing Material. ACS APPLIED MATERIALS & INTERFACES 2018; 10:35681-35684. [PMID: 30286288 DOI: 10.1021/acsami.8b13234] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Amorphous EuB6 was successfully prepared having a high specific surface area (221.3 m2 g-1) via the reaction between EuCl3 and B2H6 in the presence of liquid plasma in an ionic liquid environment. The material exhibits an immediate, lasting, and highly selective response toward formaldehyde at room temperature with a detection limit of 50 ppb. The good sensing performance of the amorphous EuB6 material is attributed to the strong interaction between formaldehyde and the increased number of accessible electron-rich surface Eu sites.
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Affiliation(s)
- Da Wei
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection , Chengdu University of Technology , Chengdu 610059 , China
- Collaborative Innovation Center of Panxi Strategic Mineral Resources Multi-purpose Utilization, College of Materials and Chemistry & Chemical Engineering , Chengdu University of Technology , Chengdu 610059 , China
| | - Jia Xie
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection , Chengdu University of Technology , Chengdu 610059 , China
- Collaborative Innovation Center of Panxi Strategic Mineral Resources Multi-purpose Utilization, College of Materials and Chemistry & Chemical Engineering , Chengdu University of Technology , Chengdu 610059 , China
| | - Dong Ge Tong
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection , Chengdu University of Technology , Chengdu 610059 , China
- Collaborative Innovation Center of Panxi Strategic Mineral Resources Multi-purpose Utilization, College of Materials and Chemistry & Chemical Engineering , Chengdu University of Technology , Chengdu 610059 , China
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65
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Shang W, Wang D, Zhang B, Jiang C, Qu F, Yang M. Aliovalent Fe(iii)-doped NiO microspheres for enhanced butanol gas sensing properties. Dalton Trans 2018; 47:15181-15188. [DOI: 10.1039/c8dt03242d] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Fe-Doped NiO multi-shelled microspheres have been synthesized via a facile hydrothermal reaction.
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Affiliation(s)
- Wenan Shang
- School of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian 116029
- PR China
- Key Laboratory of Marine Materials and Related Technologies
| | - Dongting Wang
- School of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian 116029
- PR China
- Key Laboratory of Marine Materials and Related Technologies
| | - Bingxue Zhang
- Ningbo Institute of Materials Technology and Engineering
- Chinese Academy of Sciences
- Ringgold standard institution
- Zhejiang
- China
| | - Chunjie Jiang
- School of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian 116029
- PR China
| | - Fengdong Qu
- Key Laboratory of Marine Materials and Related Technologies
- Zhejiang Key Laboratory of Marine Materials and Protective Technologies
- Ningbo Institute of Materials Technology and Engineering
- Chinese Academy of Sciences
- Ningbo 315201
| | - Minghui Yang
- Key Laboratory of Marine Materials and Related Technologies
- Zhejiang Key Laboratory of Marine Materials and Protective Technologies
- Ningbo Institute of Materials Technology and Engineering
- Chinese Academy of Sciences
- Ningbo 315201
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