Synthesis and H2S sensing performance of MoO3/Fe2(MoO4)3 yolk/shell nanostructures

RSC Advances ◽  
2015 ◽  
Vol 5 (47) ◽  
pp. 37703-37709 ◽  
Author(s):  
Xinming Gao ◽  
Chunyan Li ◽  
Zhuoxun Yin ◽  
Yujin Chen
Keyword(s):  
Gas Sensing ◽  
Response Times ◽  
Sensor Response ◽  
Shell Nanostructures ◽  
Sensing Performance

A facile method was developed to fabricate MoO3/Fe2(MoO4)3 yolk/shell nanostructures with small pores, exhibiting good H2S gas sensing performance including high sensor response, short recovery and response times, and good selectivity and stability.

scholarly journals High-Performance Gas Sensor of Polyaniline/Carbon Nanotube Composites Promoted by Interface Engineering

Sensors ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 149 ◽  
Author(s):  
Weiyu Zhang ◽  
Shuai Cao ◽  
Zhaofeng Wu ◽  
Min Zhang ◽  
Yali Cao ◽  
...  
Keyword(s):  
High Performance ◽  
Structural Changes ◽  
Gas Sensing ◽  
Response Times ◽  
Limit Of Detection ◽  
Hierarchical Structures ◽  
Cost Effective ◽  
One Dimensional ◽  
P Type ◽  
Sensing Performance

Inspired by the enhanced gas-sensing performance by the one-dimensional hierarchical structure, one-dimensional hierarchical polyaniline/multi-walled carbon nanotubes (PANI/CNT) fibers were prepared. Interestingly, the simple heating changed the sensing characteristics of PANI from p-type to n-type and n-type PANI and p-type CNTs form p–n hetero junctions at the core–shell interface of hierarchical PANI/CNT composites. The p-type PANI/CNT (p-PANI/CNT) and n-type PANI/CNT (n-PANI/CNT) performed the higher sensitivity to NO2 and NH3, respectively. The response times of p-PANI/CNT and n-PANI/CNT to 50 ppm of NO2 and NH3 are only 5.2 and 1.8 s, respectively, showing the real-time response. The estimated limit of detection for NO2 and NH3 is as low as to 16.7 and 6.4 ppb, respectively. After three months, the responses of p-PANI/CNT and n-PANI/CNT decreased by 19.1% and 11.3%, respectively. It was found that one-dimensional hierarchical structures and the deeper charge depletion layer enhanced by structural changes of PANI contributed to the sensitive and fast responses to NH3 and NO2. The formation process of the hierarchical PANI/CNT fibers, p–n transition, and the enhanced gas-sensing performance were systematically analyzed. This work also predicts the development prospects of cost-effective, high-performance PANI/CNT-based sensors.

scholarly journals Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1026
Author(s):  
Shulin Yang ◽  
Gui Lei ◽  
Huoxi Xu ◽  
Zhigao Lan ◽  
Zhao Wang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Gas Sensing ◽  
Response Times ◽  
Chemical Vapour ◽  
Pure Metal ◽  
Main Emphasis ◽  
Nanostructured Metal Oxides ◽  
Nanostructured Metal ◽  
Sensing Performance

The construction of heterojunctions has been widely applied to improve the gas sensing performance of composites composed of nanostructured metal oxides. This review summarises the recent progress on assembly methods and gas sensing behaviours of sensors based on nanostructured metal oxide heterojunctions. Various methods, including the hydrothermal method, electrospinning and chemical vapour deposition, have been successfully employed to establish metal oxide heterojunctions in the sensing materials. The sensors composed with the built nanostructured heterojunctions were found to show enhanced gas sensing performance with higher sensor responses and shorter response times to the targeted reducing or oxidising gases compare with those of the pure metal oxides. Moreover, the enhanced gas sensing mechanisms of the metal oxide-based heterojunctions to the reducing or oxidising gases are also discussed, with the main emphasis on the important role of the potential barrier on the accumulation layer.

scholarly journals Nanostructured SnO2–ZnO composite gas sensors for selective detection of carbon monoxide

2016 ◽  
Vol 7 ◽  
pp. 2045-2056 ◽  
Author(s):  
Paul Chesler ◽  
Cristian Hornoiu ◽  
Susana Mihaiu ◽  
Cristina Vladut ◽  
Jose Maria Calderon Moreno ◽  
...  
Keyword(s):  
Research Group ◽  
Gas Sensing ◽  
Porous Alumina ◽  
Sol Gel ◽  
High Sensitivity ◽  
Dip Coating ◽  
Sensor Response ◽  
Coating Method ◽  
Dip Coating Method ◽  
Sensing Performance

A series of SnO2–ZnO composite nanostructured (thin) films with different amounts of SnO2 (from 0 to 50 wt %) was prepared and deposited on a miniaturized porous alumina transducer using the sol–gel and dip coating method. The transducer, developed by our research group, contains Au interdigital electrodes on one side and a Pt heater on the other side. The sensing films were characterized using SEM and AFM techniques. Highly toxic and flammable gases (CO, CO2, CH4, and C3H8) were tested under lab conditions (carrier gas was dry air) using a special gas sensing cell developed by our research group. The gas concentrations varied between 5 and 2000 ppm and the optimum working temperatures were in the range of 210–300 °C. It was found that the sensing performance was influenced by the amount of oxide components present in the composite material. Improved sensing performance was achieved for the ZnO (98 wt %)–SnO2 (2 wt %) composite as compared to the sensors containing only the pristine oxides. The sensor response, cross-response and recovery characteristics of the analyzed materials are reported. The high sensitivity (R S = 1.21) to low amounts of CO (5 ppm) was reported for the sensor containing a composite sensitive film with ZnO (98 wt %)–SnO2 (2 wt %). This sensor response to CO was five times higher as compared to its response to CO2, CH4, and C3H8, thus the sensor is considered to be selective for CO under these test conditions.

Enhancement of nitride-gas sensing performance of SiC7 monolayer induced by external electric field

Vacuum ◽  
2021 ◽  
pp. 110393
Author(s):  
Zijia Zhao ◽  
Yongliang Yong ◽  
Ruilin Gao ◽  
Song Hu ◽  
Qingxiao Zhou ◽  
...  
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Gas Sensing ◽  
Sensing Performance

Adsorption of the Gas Molecules (NH3, C2H6O, C3H6O, CO, H2S) on noble metal (Ag, Au, Pt, Pd, Ru)–Doped MoSe2 Monolayer: A First-Principles Study

2021 ◽  
Author(s):  
Lanjuan Zhou ◽  
Sujing Yu ◽  
Yan Yang ◽  
Qi Li ◽  
Tingting Li ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Noble Metal ◽  
First Principles ◽  
Density Functional ◽  
Noble Metals ◽  
Gas Sensing ◽  
Functional Theory ◽  
First Principles Study ◽  
Gas Molecules ◽  
Sensing Performance

In this paper, the effects of five noble metals (Au, Pt, Pd, Ag, Ru) doped MoSe2 on improving gas sensing performance were predicted through density functional theory (DFT) based on...

scholarly journals Correction to: Selective ethanol gas sensing performance of flower-shaped CuO composed of thin nanoplates

2021 ◽  
Author(s):  
Ahmad Umar ◽  
A. A. Ibrahim ◽  
Hassan Algadi ◽  
Umesh T. Nakate ◽  
Sandip P. Choudhury ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Sensing Performance

Extraordinary H2S gas sensing performance of ZnO/rGO external and internal heterojunctions

2021 ◽  
pp. 160457
Author(s):  
Tran Khoa Dang ◽  
Nguyen Tang Son ◽  
Nguyen Thi Lanh ◽  
Phan Hong Phuoc ◽  
Nguyen Ngoc Viet ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Sensing Performance
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