Room Temperature Chemiresistive Gas Sensing Characteristics of Pristine Polyaniline and Polyaniline/TiO2 Nanocomposites

2020 ◽  
pp. 383-397
Author(s):  
Arvind Kumar ◽  
M. Murali Krishnan ◽  
Vipul Singh ◽  
Soumen Samanta ◽  
Niranjan S. Ramgir
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Sensing Characteristics

scholarly journals Transforming Pt-SnO2 Nanoparticles into Pt-SnO2 Composite Nanoceramics for Room-Temperature Hydrogen-Sensing Applications

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2123
Author(s):  
Ming Liu ◽  
Caochuang Wang ◽  
Pengcheng Li ◽  
Liang Cheng ◽  
Yongming Hu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Sintering Temperature ◽  
Sno2 Nanoparticles ◽  
Hydrogen Sensing ◽  
Sensing Applications ◽  
Nanostructured Metal Oxides ◽  
Low Dimensional ◽  
Sensing Characteristics ◽  
Nanostructured Metal

Many low-dimensional nanostructured metal oxides (MOXs) with impressive room-temperature gas-sensing characteristics have been synthesized, yet transforming them into relatively robust bulk materials has been quite neglected. Pt-decorated SnO2 nanoparticles with 0.25–2.5 wt% Pt were prepared, and highly attractive room-temperature hydrogen-sensing characteristics were observed for them all through pressing them into pellets. Some pressed pellets were further sintered over a wide temperature range of 600–1200 °C. Though the room-temperature hydrogen-sensing characteristics were greatly degraded in many samples after sintering, those samples with 0.25 wt% Pt and sintered at 800 °C exhibited impressive room-temperature hydrogen-sensing characteristics comparable to those of their counterparts of as-pressed pellets. The variation of room-temperature hydrogen-sensing characteristics among the samples was explained by the facts that the connectivity between SnO2 grains increases with increasing sintering temperature, and Pt promotes oxidation of SnO2 at high temperatures. These results clearly demonstrate that some low-dimensional MOX nanocrystals can be successfully transformed into bulk MOXs with improved robustness and comparable room-temperature gas-sensing characteristics.

Highly sensitive and selective room-temperature NO2 gas-sensing characteristics of SnOX-based p-type thin-film transistor

2019 ◽  
Vol 288 ◽  
pp. 625-633 ◽  
Author(s):  
Hwan-Seok Jeong ◽  
Min-Jae Park ◽  
Soo-Hun Kwon ◽  
Hyo-Jun Joo ◽  
Hyuck-In Kwon
Keyword(s):  
Thin Film ◽  
Room Temperature ◽  
Gas Sensing ◽  
Thin Film Transistor ◽  
Highly Sensitive ◽  
P Type ◽  
Sensing Characteristics

scholarly journals Improved Cl2 sensing characteristics of reduced graphene oxide when decorated with copper phthalocyanine nanoflowers

RSC Advances ◽  
2017 ◽  
Vol 7 (41) ◽  
pp. 25229-25236 ◽  
Author(s):  
Sanjeev Kumar ◽  
Navdeep Kaur ◽  
Anshul Kumar Sharma ◽  
Aman Mahajan ◽  
R. K. Bedi
Keyword(s):  
Graphene Oxide ◽  
Detection Limit ◽  
Reduced Graphene Oxide ◽  
Room Temperature ◽  
Copper Phthalocyanine ◽  
Gas Sensing ◽  
Sensing Platform ◽  
Reduced Graphene ◽  
Sensing Characteristics

A novel gas sensing platform involving a hybrid of reduced graphene oxide (rGO) sheets with unsubstituted copper phthalocyanine (CuPc) nanoflowers has been explored as a room temperature ppb level chemiresistive chlorine (Cl2) sensor with a detection limit as low as 1.97 ppb.

scholarly journals New Design of ZnO Nanorod- and Nanowire-Based NO2 Room-Temperature Sensors Prepared by Hydrothermal Method

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Vo Thanh Duoc ◽  
Dang Thi Thanh Le ◽  
Nguyen Duc Hoa ◽  
Nguyen Van Duy ◽  
Chu Manh Hung ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Room Temperature ◽  
Gas Sensing ◽  
Local Heating ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Maximal Response ◽  
Sensor Applications ◽  
Sensing Characteristics ◽  
Sensing Performance

Room-temperature gas sensors are attracting attention because of their low power consumption, safe operation, and long-term stability. Herein, ZnO nanorods (NRs) and nanowires (NWs) were on-chip grown via a facile hydrothermal method and used for room-temperature NO2 gas sensor applications. The ZnO NRs were obtained by a one-step hydrothermal process, whereas the NWs were obtained by a two-step hydrothermal process. To obtain ZnO NW sensor, the length of NRs was controlled short enough so that none of the nanorod-nanorod junction was made. Thereafter, the NWs were grown from the tips of no-contact NRs to form nanowire-nanowire junctions. The gas-sensing characteristics of ZnO NRs and NWs were tested against NO2 gas at room temperature for comparison. The gas-sensing characteristics of the sensors were also tested at different applied voltages to evaluate the effect of the self-activated gas-sensing performance. Results show that the diameter of ZnO NRs and NWs is the dominant parameter of their NO2 gas-sensing performance at room temperature. In addition, self-activation by local heating occurred for both sensors, but because the NWs were smaller and sparser than the NRs, local heating thus required a lower applied voltage with maximal response compared with the NRs.

Realizing room-temperature self-powered ethanol sensing of ZnO nanowire arrays by combining their piezoelectric, photoelectric and gas sensing characteristics

2015 ◽  
Vol 3 (7) ◽  
pp. 3529-3535 ◽  
Author(s):  
Penglei Wang ◽  
Yongming Fu ◽  
Binwei Yu ◽  
Yayu Zhao ◽  
Lili Xing ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Nanowire Arrays ◽  
Zno Nanowire ◽  
Zno Nanowire Arrays ◽  
Self Powered ◽  
Ethanol Sensing ◽  
Sensing Characteristics

Room-temperature self-powered ethanol sensing has been realized from ZnO nanowire arrays by combining their piezoelectric, photoelectric and gas sensing characteristics.

scholarly journals Theoretical and Experimental Research on Ammonia Sensing Properties of Sulfur-Doped Graphene Oxide

Chemosensors ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 220
Author(s):  
Yao Yu ◽  
Zhijia Liao ◽  
Fanli Meng ◽  
Zhenyu Yuan
Keyword(s):  
Graphene Oxide ◽  
Electrical Properties ◽  
Recovery Time ◽  
Room Temperature ◽  
Gas Sensing ◽  
Theoretical Models ◽  
Ammonia Sensing ◽  
Doped Graphene ◽  
Response And Recovery ◽  
Sensing Characteristics

In this paper, gas sensing characteristics of sulfur-doped graphene oxide (S-GO) are firstly presented. The results of the sensing test revealed that, at room temperature (20 °C), S-GO has the optimal sensitivity to NH3. The S-GO gas sensor has a relatively short response and recovery time for the NH3 detection. Further, the sensing limit of ammonia at room temperature is 0.5 ppm. Theoretical models of graphene and S-doped graphene are established, and electrical properties of the graphene and S-doped graphene are calculated. The enhanced sensing performance was ascribed to the electrical properties’ improvement after the graphene was S-doped.

UV-Assisted Room Temperature Gas Sensing with ZnO-Ag Heterostructure Nanocrystals Studied by Photoluminescence

2021 ◽  
Vol 21 (9) ◽  
pp. 4865-4869
Author(s):  
Mei Long ◽  
Huan Yuan ◽  
Ping Sun ◽  
Lei Su ◽  
Xiangping Jiang
Keyword(s):  
Room Temperature ◽  
Doping Concentration ◽  
Gas Sensing ◽  
Polymer Network ◽  
Ag Doping ◽  
Sensing Applications ◽  
Zinc Interstitial ◽  
Metal Metal ◽  
Gas Sensing Properties ◽  
Sensing Characteristics

Noble metal-metal oxide nanohybrids play a significant contribution in gas sensing applications at room temperature. Here, Ag-loaded ZnO with different Ag doping concentration are prepared by two-step polymer-network gel method, and NO2 sensing characteristics are tested at room temperature with various concentrations. The nanocrystal sizes are found to be more uniform with increasing with Ag concentration, and photoluminescence spectroscopy further reveals the different defects in ZnO–Ag nanocrystal lattices: pure ZnO has the largest intensity of the conduction band to valence band combination, and ZnO–Ag-1 (1 mol% Ag doping concentration) has the largest oxygen vacancy content, while ZnO–Ag-3 (3 mol% Ag doping concentration) has the largest excess zinc interstitial. It is showed that the gas sensing properties are independent of the size of nanocrystals, and more dependent on the nanocrystal defect structure. In this work, a new sensing mechanism is proposed according to the experimental results.

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