scholarly journals MoS2 Nanosheets Sensitized with Quantum Dots for Room-Temperature Gas Sensors

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Jingyao Liu ◽  
Zhixiang Hu ◽  
Yuzhu Zhang ◽  
Hua-Yao Li ◽  
Naibo Gao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Gas Sensors ◽  
High Performance ◽  
Large Scale ◽  
Room Temperature ◽  
Gas Sensing ◽  
Low Cost ◽  
Surface And Interface ◽  
Sensor Performance ◽  
Semiconductor Gas Sensors

AbstractThe Internet of things for environment monitoring requires high performance with low power-consumption gas sensors which could be easily integrated into large-scale sensor network. While semiconductor gas sensors have many advantages such as excellent sensitivity and low cost, their application is limited by their high operating temperature. Two-dimensional (2D) layered materials, typically molybdenum disulfide (MoS2) nanosheets, are emerging as promising gas-sensing materials candidates owing to their abundant edge sites and high in-plane carrier mobility. This work aims to overcome the sluggish and weak response as well as incomplete recovery of MoS2 gas sensors at room temperature by sensitizing MoS2 nanosheets with PbS quantum dots (QDs). The huge amount of surface dangling bonds of QDs enables them to be ideal receptors for gas molecules. The sensitized MoS2 gas sensor exhibited fast and recoverable response when operated at room temperature, and the limit of NO2 detection was estimated to be 94 ppb. The strategy of sensitizing 2D nanosheets with sensitive QD receptors may enhance receptor and transducer functions as well as the utility factor that determine the sensor performance, offering a powerful new degree of freedom to the surface and interface engineering of semiconductor gas sensors.

Fabrication of a Carbon Nanotube Gas Sensor Microelectrodes and its Application for Ammonia Detection

2013 ◽  
Vol 431 ◽  
pp. 306-311
Author(s):  
Xiang Tao Ran ◽  
Zhi Wang ◽  
Li Yang
Keyword(s):  
Gas Sensors ◽  
High Performance ◽  
Gas Sensing ◽  
Structural Parameters ◽  
Low Cost ◽  
Manufacturing Method ◽  
Multi Walled Carbon Nanotubes ◽  
Ammonia Detection ◽  
Low Cost Manufacturing ◽  
Walled Carbon Nanotubes

With the increasing needs for high-performance gas sensors in industrial production, environmental monitoring and so on, the research on gas sensors is becoming more and more important. In this paper, the electric field intensity distribution simulation process of the interdigital microelectrodes (IMEs) is discussed in details to get the proper electrode structural parameters. The IMEs on the ITO surface with a minimum gap of about 4μm are achieved by lithography, which provides a reliable, low-cost manufacturing method. Sensitive components are made of the multi-walled carbon nanotubes modified materials. The gas-sensing property of the sensor is detected for ammonia. The experiment result shows that the performance of the nanomodified sensor is obviously improved.

2D WS2 nanosheets with TiO2 quantum dots decoration for high-performance ammonia gas sensing at room temperature

2017 ◽  
Vol 253 ◽  
pp. 1034-1042 ◽  
Author(s):  
Ziyu Qin ◽  
Chao Ouyang ◽  
Jian Zhang ◽  
Li Wan ◽  
Shimin Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Performance ◽  
Room Temperature ◽  
Gas Sensing ◽  
Ammonia Gas ◽  
Ws2 Nanosheets

ZnO-Based Gas Sensors Prepared by EPD and Hydrothermal Growth

2015 ◽  
Vol 654 ◽  
pp. 94-98 ◽  
Author(s):  
Roman Yatskiv ◽  
María Verde ◽  
Jan Grym
Keyword(s):  
Gas Sensors ◽  
Room Temperature ◽  
Gas Sensing ◽  
Low Cost ◽  
Zno Nanorods ◽  
Zno Films ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Current Voltage ◽  
Gas Sensing Properties

Arrays of vertically well aligned ZnO nanorods (NRs) were prepared on nanostructured ZnO films using a low temperature hydrothermal method. We propose the use of the low cost, environmentally friendly electrophoretic deposition technique (EPD) as seeding procedure, which allows the obtaining of homogeneous, well oriented nanostructured ZnO thin films. ZnO nanorod arrays were covered with graphite in order to prepare graphite/ZnO NRs junctions. These nanostructured junctions showed promising current-voltage rectifying characteristics and gas sensing properties at room temperature.

Electrospraying preparation of metal germanate nanospheres for high-performance lithium-ion batteries and room-temperature gas sensors

Nanoscale ◽  
2019 ◽  
Vol 11 (25) ◽  
pp. 12116-12123 ◽  
Author(s):  
Rui Li ◽  
Renmu Zhang ◽  
Zheng Lou ◽  
Tingting Huang ◽  
Kai Jiang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Gas Sensors ◽  
High Performance ◽  
Large Scale ◽  
Room Temperature ◽  
Lithium Ion ◽  
Ammonia Gas ◽  
Potential Applications ◽  
Ammonia Gas Sensors

Metal germanate nanospheres including Ca2Ge7O16, Zn2GeO4 and SrGe4O9 were prepared by a facile and large-scale electrospraying process. They have potential applications in lithium-ion batteries and room temperature ammonia gas sensors.

A review: electrical and gas sensing properties of polyaniline/ferrite nanocomposites

Sensor Review ◽  
2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Thejas Ramakrishnaiah ◽  
Prasanna Gunderi Dhananjaya ◽  
Chaturmukha Vakwadi Sainagesh ◽  
Sathish Reddy ◽  
Swaroop Kumaraswamy ◽  
...  
Keyword(s):  
Gas Sensors ◽  
High Performance ◽  
Room Temperature ◽  
Gas Sensing ◽  
Cost Effective ◽  
Content Type ◽  
Sensing Properties ◽  
Long Term Stability ◽  
Gas Sensing Properties

Purpose This paper aims to study the various developments taking place in the field of gas sensors made from polyaniline (PANI) nanocomposites, which leads to the development of high-performance electrical and gas sensing materials operating at room temperature. Design/methodology/approach PANI/ferrite nanocomposites exhibit good electrical properties with lower dielectric losses. There are numerous reports on PANI and ferrite nanomaterial-based gas sensors which have good sensing response, feasible to operate at room temperature, requires less power and cost-effective. Findings This paper provides an overview of electrical and gas sensing properties of PANI/ferrite nanocomposites having improved selectivity, long-term stability and other sensing performance of sensors at room temperature. Originality/value The main purpose of this review paper is to focus on PANI/ferrite nanocomposite-based gas sensors operating at room temperature.

Large-scale Production of Selective Gas Sensors Based on Carbon Nanotube Mats Transistors

2010 ◽  
Vol 1253 ◽  
Author(s):  
Louis Gorintin ◽  
Paolo Bondavalli ◽  
pierre legagneux ◽  
Marc Chatelet
Keyword(s):  
Gas Sensors ◽  
Large Scale ◽  
Gas Sensing ◽  
Field Effect Transistors ◽  
Low Cost ◽  
Flexible Substrates ◽  
Scale Production ◽  
Metal Electrodes ◽  
Sensing Applications ◽  
Large Scale Production

AbstractThe first paper showing the great potentiality of Carbon Nanotubes Field Effect transistors (CNTFETs) for gas sensing applications was published in 2000 [1]. It has been demonstrated that the performances of this kind of sensors are extremely interesting : a sensitivity of around 100ppt (e.g. for NO2 [2]) has been achieved in 2003 and several techniques to improve selectivity have been tested with very promising results [2]. The main issues that have not allowed, up to now, these devices to strike more largely the market of sensors, have been the lack of an industrial method to obtain low-cost devices, a demonstration of their selectivity in relevant environments and finally a deeper study on the effect of humidity and the possible solutions to reduce it. This contribution deals with CNTFETs based sensors fabricated using air-brush technique deposition on large surfaces. Compared to our last contribution [3], we have optimized the air-brush technique in order to obtain high performances transistors (Log(Ion)/ Log(Ioff) ~ 5/6) with highly reproducible characteristics : this is a key point for the industrial exploitation. We have developed a machine which allows us the dynamic deposition on heated substrates of the SWCNT solutions, improving dramatically the uniformity of the SWCNT mats. We have performed tests using different solvents that could be adapted as a function of the substrates (e.g. flexible substrates). Moreover these transistors have been achieved using different metal electrodes (patented approach [4]) in order to improve selectivity. Results of tests using NO2, NH3 with concentrations between ~ 1ppm and 10ppm will be shown during the meeting.

scholarly journals Investigation of CO2 reaction with copper oxide nanoparticles for room temperature gas sensing

2016 ◽  
Vol 4 (14) ◽  
pp. 5294-5302 ◽  
Author(s):  
N. B. Tanvir ◽  
O. Yurchenko ◽  
Ch. Wilbertz ◽  
G. Urban
Keyword(s):  
Low Power ◽  
Copper Oxide ◽  
Work Function ◽  
Gas Sensors ◽  
Room Temperature ◽  
Gas Sensing ◽  
Low Cost ◽  
Copper Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Reversible Formation

CO2 sensing at room temperature: the interaction of CO2 and H2O with copper oxide nanoparticles results in reversible formation of basic carbonates. This phenomenon is the key reaction for the work function readout based CO2 sensing which enables the prospects towards low power and low cost gas sensors.

Ultrafast NH3 Sensing Properties of WO3@CoWO4 Heterojunction Nanofibres at Room Temperature

2018 ◽  
Vol 71 (3) ◽  
pp. 87 ◽  
Author(s):  
Yiming Zhao ◽  
Muhammad Ikram ◽  
Jianzhou Wang ◽  
Zhi Liu ◽  
Lijuan Du ◽  
...  
Keyword(s):  
Single Crystal ◽  
Rational Design ◽  
Large Scale ◽  
Room Temperature ◽  
Gas Sensing ◽  
Response Times ◽  
Low Cost ◽  
Atomic Ratio ◽  
Scale Production ◽  
Sensing Properties

Highly selective detection, quick response times (<5 s), and superior response (|Rn – Ra|/Ra = 1.17) to NH3 gas, particularly at room temperature (RT), are still enormous challenges in gas sensor applications. In this paper, a rational design and facile synthesis for a NH3 sensor have been proposed. Massage ball-like WO3@CoWO4 (Co-W) nanofibres (NFs) were prepared by a facile one-step synthesis utilising an electrospinning approach, followed by appropriate calcination. A Co-W NF sensor with a Co-to-W atomic ratio of 3 : 10 (Co-W-3), which consisted of nano-sized WO3 protrusions (10–15 nm) on submicrometre-sized single crystal CoWO4 particles (100–150 nm) exhibited excellent gas-sensing properties at RT due to the single crystal CoWO4–CoWO4 homojunction structure and distinct massage ball-like WO3–CoWO4 heterojunction. The approach developed in this work will be important for the low-cost and large-scale production of a Co-W-3 ultrafast sensing material with highly promising applications in gas sensors.

High Performance CO Sensors Utilizing Sprayed Distributed Toluene-Based Gold Nanoparticles

2013 ◽  
Vol 479-480 ◽  
pp. 702-707
Author(s):  
Chun Yi Wang ◽  
Ho Cheng Lee ◽  
Yung Chen Wu ◽  
Che Hsin Lin
Keyword(s):  
Gold Nanoparticles ◽  
Gas Sensors ◽  
High Performance ◽  
Room Temperature ◽  
Low Cost ◽  
Spray Coating ◽  
Repeated Measurements ◽  
Au Nps ◽  
Working Temperature ◽  
Co Gas

This study presents a simple and low-cost spray coating process for producing high performance CO (carbon monoxide) sensors utilizing toluene-based gold nanoparticles (Au-NPs). Thanks to the success synthesis of Au-NPs in toluene, this low surface tension organic solvent prevents Au-NPs from colligation. And therefore Au-NPs can be well dispersed on the surface of the electrodes as the sensing layer during spraying. To compare with the typical metal oxide based CO sensors that have to work at a higher working temperature of about 150~350°C, the produced sensor can work at room temperature and have a better detection limit for CO gas (5 ppm). Experimental results indicate good linear sensitivity under repeated measurements for concentration range from 5 250 ppm (R2=0.996). The repeatability is also confirmed by measuring 100 ppm CO gas, the calculated variation is less than 2.8% for six repeating measurements. The process developed in this study can be used to produce not only high performance CO gas sensors but other related gas sensors.

scholarly journals Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

Chemosensors ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 179
Author(s):  
Zhenyu Yuan ◽  
Chang Yang ◽  
Fanli Meng
Keyword(s):  
Gas Sensors ◽  
Control Strategy ◽  
High Performance ◽  
Low Cost ◽  
Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Filter Membrane ◽  
Semiconductor Gas Sensors ◽  
Doping Modification

Formaldehyde is a poisonous and harmful gas, which is ubiquitous in our daily life. Long-term exposure to formaldehyde harms human body functions; therefore, it is urgent to fabricate sensors for the real-time monitoring of formaldehyde concentrations. Metal oxide semiconductor (MOS) gas sensors is favored by researchers as a result of their low cost, simple operation and portability. In this paper, the mechanism of formaldehyde detection by gas sensors is introduced, and then the ways of ameliorating the response of gas sensors for formaldehyde detection in recent years are summarized. These methods include the control of the microstructure and morphology of sensing materials, the doping modification of matrix materials, the development of new semiconductor sensing materials, the outfield control strategy and the construction of the filter membrane. These five methods will provide a good prerequisite for the preparation of better performing formaldehyde gas sensors.

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