scholarly journals Highly Sensitive Detection of NO2 by Au and TiO2 Nanoparticles Decorated SWCNTs Sensors

Sensors ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 12 ◽  
Author(s):  
Ada Fort ◽  
Enza Panzardi ◽  
Ammar Al-Hamry ◽  
Valerio Vignoli ◽  
Marco Mugnaini ◽  
...  
Keyword(s):  
Response Time ◽  
Tio2 Nanoparticles ◽  
High Performance ◽  
Room Temperature ◽  
Gas Sensing ◽  
Nano Particles ◽  
Single Wall Carbon Nanotubes ◽  
Time Sensitivity ◽  
Highly Sensitive ◽  
Highly Sensitive Detection

The aim of this work is to investigate the gas sensing performance of single wall carbon nanotubes (SWCNTs)-based conductive sensors operating at low–medium temperatures (<250 °C). The investigated sensing films consists of an SWCNT network obtained by drop-casting a SWCNT suspension. Starting from this base preparation, different sensing devices were obtained by decorating the SWCNT network with materials suitable for enhancing the sensitivity toward the target gas. In particular, in this paper, nano-particles of gold and of TiO2 were used. In the paper, the performance of the different sensing devices, in terms of response time, sensitivity toward NO2 and cross-sensitivity to O2, CO and water vapor, were assessed and discussed. Sensors based on decorated SWCNT films showed high performance; in particular, the decoration with Au nano-particles allows for a large enhancement of sensitivity (reaching 10%/1 ppm at 240 °C) and a large reduction of response time. On the other hand, the addition of TiO2 nanoparticles leads to a satisfactory improvement of the sensitivity as well as a significant reduction of the response time at moderate temperatures (down to 200 °C). Finally, the suitability of using Au decorated SWCNTs-based sensors for room temperature sensing is demonstrated.

scholarly journals Gold and ZnO-Based Metal-Semiconductor Network for Highly Sensitive Room-Temperature Gas Sensing

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3815
Author(s):  
Renyun Zhang ◽  
Magnus Hummelgård ◽  
Joel Ljunggren ◽  
Håkan Olin
Keyword(s):  
Solar Cells ◽  
Gas Sensor ◽  
Network Structure ◽  
Room Temperature ◽  
Gas Sensing ◽  
Zno Nanowires ◽  
Gold Particles ◽  
Highly Sensitive ◽  
Semiconductor Electronics ◽  
New Type

Metal-semiconductor junctions and interfaces have been studied for many years due to their importance in applications such as semiconductor electronics and solar cells. However, semiconductor-metal networks are less studied because there is a lack of effective methods to fabricate such structures. Here, we report a novel Au–ZnO-based metal-semiconductor (M-S)n network in which ZnO nanowires were grown horizontally on gold particles and extended to reach the neighboring particles, forming an (M-S)n network. The (M-S)n network was further used as a gas sensor for sensing ethanol and acetone gases. The results show that the (M-S)n network is sensitive to ethanol (28.1 ppm) and acetone (22.3 ppm) gases and has the capacity to recognize the two gases based on differences in the saturation time. This study provides a method for producing a new type of metal-semiconductor network structure and demonstrates its application in gas sensing.

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.

Ultraviolet light-emitting diode-assisted highly sensitive room temperature NO2 gas sensor for low-temperature solution-processed ZnO/TiO2 nanorods decorated with plasmonic Au nanoparticles

Nanoscale ◽  
2021 ◽  
Author(s):  
Soon-Hwan Kwon ◽  
Tae-Hyeon Kim ◽  
Sang-Min Kim ◽  
Semi Oh ◽  
Kyoung-Kook Kim
Keyword(s):  
Gas Sensors ◽  
High Performance ◽  
Room Temperature ◽  
Au Nanoparticles ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
No2 Gas Sensor ◽  
Highly Sensitive ◽  
Temperature Solution ◽  
Semiconducting Metal Oxides

Nanostructured semiconducting metal oxides such as SnO2, ZnO, TiO2, and CuO have been widely used to fabricate high performance gas sensors. To improve the sensitivity and stability of gas sensors,...

Effects of Heat Annealing on the Gas Sensing Properties of Spin Coated Unsubstituted Copper Phthalocyanine Films

2015 ◽  
Vol 1110 ◽  
pp. 241-245
Author(s):  
Ashok Datir ◽  
Pankaj Koinkar ◽  
Sanjay Chakane
Keyword(s):  
Response Time ◽  
Spin Coating ◽  
Recovery Rate ◽  
Response Rate ◽  
Copper Phthalocyanine ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Lower Response ◽  
Time Sensitivity ◽  
Gas Sensing Properties

Unsubstituted copper phthalocyanine (CuPc) thin films on glass substrate were prepared using spin coating technique. The effects of heat annealing of CuPc films on the NO2 gas sensing properties were studied. The results showed that the films annealed at 150°C have highest sensitivity, highest response rate and lower response time. Sensitivity and response rate were decreased and response time was increased after annealing with temperature 200°C and above. The duration over which the films were annealed changes the gas sensing properties. Highest sensitivity, highest response rate, lower response time and highest recovery rate were observed for 2 hour (150°C) annealed films. Longer annealing time causes the decrease of sensitivity, response rate and recovery rate and increase of response time however improves recovery ratio. The heat treatment limited to the temperature of 150°C for 2 hours duration improves the sensing properties of the films. Hence heat annealed unsubstituted CuPc spin coated films can be used as nitrogen dioxide gas sensor.

Amorphous covalent triazine frameworks for high performance room temperature ammonia gas sensing

2014 ◽  
Vol 38 (7) ◽  
pp. 2774 ◽  
Author(s):  
Li-Ming Tao ◽  
Fang Niu ◽  
Di Zhang ◽  
Ting-Mei Wang ◽  
Qi-Hua Wang
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Gas Sensing ◽  
Ammonia Gas

3D-multilayer MoS2 nanosheets vertically grown on highly mesoporous cubic In2O3 for high-performance gas sensing at room temperature

2019 ◽  
Vol 466 ◽  
pp. 1-11 ◽  
Author(s):  
Muhammad Ikram ◽  
Yang Liu ◽  
He Lv ◽  
Lujia Liu ◽  
Afrasiab Ur Rehman ◽  
...  
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Gas Sensing ◽  
Mos2 Nanosheets

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

WO3-Based Sensor Based on Hall Effect for NO2 Detection: Designed and Investigation

2010 ◽  
Vol 148-149 ◽  
pp. 1042-1046
Author(s):  
Jin Yang Lin ◽  
Yong Ai Zhang ◽  
Ling Jie Wang ◽  
Tai Liang Guo
Keyword(s):  
Magnetic Field ◽  
Response Time ◽  
Hall Effect ◽  
Tungsten Trioxide ◽  
Recovery Time ◽  
Room Temperature ◽  
Gas Sensing ◽  
Test Chamber ◽  
Tungsten Filament ◽  
Gas Sensing Properties

Novel tungsten oxide sensors were fabricated based on Hall Effect and their NO2 gas sensing properties were examined. Tungsten trioxide was grown by vapor evaporation of metal tungsten filament in an oxygen atmosphere. A WO3 thick film was deposited on the four Au electrode to be a WO3 sensor. The sensor was tested between magnetic field in a plastic test chamber. The gas sensing experiment revealed that at the NO2 concentration of 40 ppm, a sensitivity of 3.27, a response time of 36 s, and a recovery time of 45 s were observed at room-temperature. The effect of WO3 based on Hall Effect on the sensing characteristic is discussed.

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