scholarly journals Enhanced gas sensing performance of graphene/ZnS-CdS hetero-nanowires gas sensor synthesized by Langmuir-Blodgett self-assembly method

2017 ◽  
Vol 922 ◽  
pp. 012023
Author(s):  
Hu Li ◽  
Ishtiaq Hassan Wani ◽  
Anumol Ashok ◽  
Yuanyuan Han ◽  
S. Hassan M. Jafri ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Self Assembly ◽  
Gas Sensing ◽  
Langmuir Blodgett ◽  
Assembly Method ◽  
Sensing Performance

A dimethyl methylphonate sensor based on HFIPPH modified SWCNTs

2022 ◽  
Author(s):  
Haiyang Wu ◽  
Yubin Yuan ◽  
Qiang Wu ◽  
Xiangrui Bu ◽  
Long Hu ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Self Assembly ◽  
High Performance ◽  
Gas Sensing ◽  
Detection System ◽  
High Sensitivity ◽  
Assembly Method ◽  
Sensitivity And Selectivity ◽  
Effect Transistor ◽  
Walled Carbon Nanotubes

Abstract In order to meet the requirements of ultra-fast real-time monitoring of sarin simulator with high sensitivity and selectivity, it is of great significance to develop high performance dimethyl methylphonate (DMMP) sensor. Herein, we proposed a DMMP sensor based on p-hexafluoroisopropanol phenyl (HFIPPH) modified self-assembled single-walled carbon nanotubes (SWCNTs) with field effect transistor (FET) structure. The self-assembly method provides a 4 nanometres thick and micron sized SWCNT channel, with high selectivity to DMMP. The proposed SWCNTs-HFIPPH based sensor exhibits remarkably higher response to DMMP than bare SWCNT based gas sensor within only few seconds. The gas sensing response of SWCNTs-HFIPPH based sensor for 1ppm DMMP is 18.2%, and the response time is about 10 seconds. What's more, the gas sensor we proposed here shows excellent selectivity and reproducibility, and the limitation of detection is as low as ppb level. The proposed method lays the foundation for miniaturization and integration of DMMP sensors, expecting to develop detection system for practical sarin sensing application.

scholarly journals Enhancing room-temperature NO2 gas sensing performance based on a metal phthalocyanine/graphene quantum dot hybrid material

RSC Advances ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 5618-5628
Author(s):  
Wenkai Jiang ◽  
Xinwei Chen ◽  
Tao Wang ◽  
Bolong Li ◽  
Min Zeng ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Gas Sensor ◽  
Hybrid Material ◽  
High Performance ◽  
Room Temperature ◽  
Gas Sensing ◽  
Metal Phthalocyanine ◽  
Graphene Quantum Dot ◽  
Sensing Performance

A high performance gas sensor based on a metal phthalocyanine/graphene quantum dot hybrid material was fabricated for NO2 detection at room-temperature.

scholarly journals High Performance Acetylene Sensor with Heterostructure Based on WO3 Nanolamellae/Reduced Graphene Oxide (rGO) Nanosheets Operating at Low Temperature

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 909 ◽  
Author(s):  
Zikai Jiang ◽  
Weigen Chen ◽  
Lingfeng Jin ◽  
Fang Cui ◽  
Zihao Song ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Sensor ◽  
High Performance ◽  
Gas Sensing ◽  
Hybrid Nanocomposites ◽  
Transformer Oil ◽  
X Ray ◽  
Reduced Graphene ◽  
Sensing Performance

The development of functionalized metal oxide/reduced graphene oxide (rGO) hybrid nanocomposites concerning power equipment failure diagnosis is one of the most recent topics. In this work, WO3 nanolamellae/reduced graphene oxide (rGO) nanocomposites with different contents of GO (0.5 wt %, 1 wt %, 2 wt %, 4 wt %) were synthesized via controlled hydrothermal method. X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric analyses-derivative thermogravimetric analysis-differential scanning calorimetry (TG-DTG-DSC), BET, and photoluminescence (PL) spectroscopy were utilized to investigate morphological characterizations of prepared gas sensing materials and indicated that high quality WO3 nanolamellae were widely distributed among graphene sheets. Experimental ceramic planar gas sensors composing of interdigitated alumina substrates, Au electrodes, and RuO2 heating layer were coated with WO3 nanolamellae/reduced graphene oxide (rGO) films by spin-coating technique and then tested for gas sensing towards multi-concentrations of acetylene (C2H2) gases in a carrier gas with operating temperature ranging from 50 °C to 400 °C. Among four contents of prepared samples, sensing materials with 1 wt % GO nanocomposite exhibited the best C2H2 sensing performance with lower optimal working temperature (150 °C), higher sensor response (15.0 toward 50 ppm), faster response-recovery time (52 s and 27 s), lower detection limitation (1.3 ppm), long-term stability, and excellent repeatability. The gas sensing mechanism for enhanced sensing performance of nanocomposite is possibly attributed to the formation of p-n heterojunction and the active interaction between WO3 nanolamellae and rGO sheets. Besides, the introduction of rGO nanosheets leads to the impurity of synthesized materials, which creates more defects and promotes larger specific area for gas adsorption, outstanding conductivity, and faster carrier transport. The superior gas sensing properties of WO3/rGO based gas sensor may contribute to the development of a high-performance ppm-level gas sensor for the online monitoring of dissolved C2H2 gas in large-scale transformer oil.

In Situ Self-Assembled Graphene-Polyaniline Nanocomposite Thin Films for Ammonia Gas Sensor

2014 ◽  
Vol 998-999 ◽  
pp. 63-66
Author(s):  
Ning Jie Guo ◽  
Hui Ling Tai ◽  
Zong Biao Ye ◽  
Guang Zhong Xie
Keyword(s):  
Gas Sensor ◽  
Self Assembly ◽  
Nanocomposite Film ◽  
Graphene Film ◽  
Ammonia Gas ◽  
Assembly Method ◽  
Vis Spectroscopy ◽  
Nanocomposite Thin Films ◽  
Polyaniline Nanocomposite

In this paper, the graphene-polyaniline (PANI) nanocomposite thin film was prepared by the in situ self-assembly method for the ammonia (NH3) gas sensor application, which was characterized by scanning electron microscopy (SEM) and UV-vis spectroscopy. The NH3 sensing performance and mechanism of the nanocomposite film were investigated. The results revealed that the sensor based on graphene-polyaniline nanocomposite film exhibited better sensing properties and restorability than those of single graphene film.

Xylene gas sensor based on Ni doped TiO2 bowl-like submicron particles with enhanced sensing performance

RSC Advances ◽  
2015 ◽  
Vol 5 (36) ◽  
pp. 28105-28110 ◽  
Author(s):  
Linghui Zhu ◽  
Dezhong Zhang ◽  
Ying Wang ◽  
Caihui Feng ◽  
Jingran Zhou ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Submicron Particles ◽  
Doped Tio2 ◽  
Sensing Performance

Bowl-like TiO2 submicron particles prepared by electrospray technique were used to detect xylene gas and Ni element was added into TiO2 to improve the gas sensing performances.

Integrated pre-concentrator gas sensor system for improved trace gas sensing performance

2016 ◽  
Author(s):  
Martin Leidinger ◽  
Tilman Sauerwald ◽  
Andreas Schutze ◽  
Christine Alepee ◽  
Max Rieger
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Sensor System ◽  
Trace Gas ◽  
Trace Gas Sensing ◽  
Sensing Performance

A chitosan–Pt nanoparticles/carbon nanotubes-doped phosphomolybdate nanocomposite as a platform for the sensitive detection of nitrite in tap water

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 937-946 ◽  
Author(s):  
Zhenyuan Bai ◽  
Chunlei Zhou ◽  
Ning Gao ◽  
Haijun Pang ◽  
Huiyuan Ma
Keyword(s):  
Carbon Nanotubes ◽  
Electron Transfer ◽  
Composite Film ◽  
Self Assembly ◽  
Tap Water ◽  
Pt Nanoparticles ◽  
Sensitive Detection ◽  
Assembly Method ◽  
Nitrite Sensor ◽  
Sensing Performance

A polyoxometalate-based composite film decorated with CNTs and Pt–CHIT NPs was constructed on an electrode using the LBL self-assembly method. It acted as an electrochemical nitrite sensor with greatly enhanced electron transfer ability and sensing performance.

scholarly journals Construction of MoO3/MoSe2 nanocomposite based gas sensor for low detection limit trimethylamine sensing at room temperature

2021 ◽  
Author(s):  
Lanjuan Zhou ◽  
Qian Mi ◽  
Yingbo Jin ◽  
Tingting Li ◽  
Dongzhi Zhang
Keyword(s):  
Detection Limit ◽  
Gas Sensor ◽  
Room Temperature ◽  
Gas Sensing ◽  
Microstructural Characterization ◽  
Honeycomb Structure ◽  
Gas Sensitivity ◽  
Characterization Methods ◽  
Low Detection Limit ◽  
Sensing Performance

Abstract In this paper, MoO3/MoSe2 n-n heterostructure was constructed for fabricating trimethylamine (TMA) gas sensor by an improved hydrothermal and spin-coating method. The surface morphology and microstructure of the prepared materials were analyzed by XRD, XPS, SEM and TEM characterization methods. The microstructural characterization results demonstrated that the MoO3/MoSe2 heterostructure had been successfully synthesized, in which the MoSe2 had a flower-shaped structure, and MoO3 had a rod-shaped structure. At the same time, the MoSe2 surface exhibited periodic honeycomb structure. The gas-sensitivity experimental results showed that the proposed MoO3/MoSe2 sensor had excellent TMA sensing performance at room temperature, including high response capability, low detection limit (20 ppb), short response/recovery time (12 s/19 s), long-term stability, good repeatability and outstanding selectivity. The heterostructure of MoO3/MoSe2 had made outstanding contributions to the enhanced TMA gas sensing performance at room temperature.

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