scholarly journals A Novel Type Room Temperature Surface Photovoltage Gas Sensor Device

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2919 ◽  
Author(s):  
Monika Kwoka ◽  
Michal Borysiewicz ◽  
Pawel Tomkiewicz ◽  
Anna Piotrowska ◽  
Jacek Szuber
Keyword(s):  
Gas Sensor ◽  
Room Temperature ◽  
Gas Sensing ◽  
Signal To Noise Ratio ◽  
Fast Response ◽  
Surface Photovoltage ◽  
Kelvin Probe ◽  
Sensor Device ◽  
Sensing Material ◽  
Highly Sensitive

In this paper a novel type of a highly sensitive gas sensor device based on the surface photovoltage effect is described. It is based on the Kelvin probe approach. Porous ZnO nanostructured thin films deposited by the direct current (DC) reactive magnetron sputtering method are used as the active gas sensing electrode material. Crucially, the obtained gas sensing material exhibited a nanocoral surface morphology and surface Zn to O non-stoichiometry with respect to its bulk mass. Among other responses, the demonstrated SPV gas sensor device exhibits a high response to an NO2 concentration as low as 1 ppm, with a signal to noise ratio of about 50 and a fast response time of several seconds under room temperature conditions.

scholarly journals A Novel Type Room Temperature Surface Photovoltage Gas Sensor Device 

2018 ◽  
Author(s):  
Monika Kwoka ◽  
Michal A. Borysiewicz ◽  
Pawel Tomkiewicz ◽  
Anna Piotrowska ◽  
Jacek Szuber
Keyword(s):  
Gas Sensor ◽  
Room Temperature ◽  
Gas Sensing ◽  
Signal To Noise Ratio ◽  
High Sensitivity ◽  
Fast Response ◽  
Surface Photovoltage ◽  
Kelvin Probe ◽  
Sensor Device ◽  
Developed Surface

In this paper a novel type of a highly sensitive gas sensor device based on the surface photovoltage effect is described. The developed surface photovoltage gas sensor is based on a reverse Kelvin probe approach. As the active gas sensing electrode the porous ZnO nanostructured thin films are used deposited by the direct current (DC) reactive magnetron sputtering method exhibiting the nanocoral surface morphology combined with an evident surface nonstoichiometry related to the unintentional surface carbon and water vapor contaminations. Among others, the demonstrated SPV gas sensor device exhibits a high sensitivity of 1 ppm to NO2 with a signal to noise ratio of about 50 and a fast response time of several seconds under the room temperature conditions.

scholarly journals A Room-Temperature CNT/Fe3O4 Based Passive Wireless Gas Sensor

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3542 ◽  
Author(s):  
Tao Guo ◽  
Tianhao Zhou ◽  
Qiulin Tan ◽  
Qianqian Guo ◽  
Fengxiang Lu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Gas Sensor ◽  
Room Temperature ◽  
Gas Sensing ◽  
Low Cost ◽  
Fast Response ◽  
Sensing Material ◽  
Recovery Times ◽  
Response And Recovery ◽  
Good Repeatability

A carbon nanotube/Fe3O4 thin film-based wireless passive gas sensor with better performance is proposed. The sensitive test mechanism of LC (Inductance and capacitance resonant) wireless sensors is analyzed and the reason for choosing Fe3O4 as a gas sensing material is explained. The design and fabrication process of the sensor and the testing method are introduced. Experimental results reveal that the proposed carbon nanotube (CNT)/Fe3O4 based sensor performs well on sensing ammonia (NH3) at room temperature. The sensor exhibits not only an excellent response, good selectivity, and fast response and recovery times at room temperature, but is also characterized by good repeatability and low cost. The results for the wireless gas sensor’s performance for different NH3 gas concentrations are presented. The developed device is promising for the establishment of wireless gas sensors in harsh environments.

scholarly journals Studies of NO2 Gas-Sensing Characteristics of a Novel Room-Temperature Surface-Photovoltage Gas Sensor Device

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 408 ◽  
Author(s):  
Monika Kwoka ◽  
Jacek Szuber
Keyword(s):  
Gas Sensor ◽  
Gas Flow ◽  
Room Temperature ◽  
Gas Sensing ◽  
Relative Concentration ◽  
Surface Photovoltage ◽  
Sensor Device ◽  
Gas Atmosphere ◽  
Sensing Characteristics ◽  
Temperature Surface

In this work the characteristics of a novel type of room temperature NO2 gas sensor device based on the surface photovoltage effect are described. It was shown that for our SPV gas sensor device, using porous sputtered ZnO nanostructured thin films as the active gas sensing electrode material, the basic gas sensor characteristics in a toxic NO2 gas atmosphere are strongly dependent on the target NO2 gas flow rate. Moreover, it was also confirmed that our SPV gas sensor device is able to detect the lowest NO2 relative concentration at the level of 125 ppb, with respect to the commonly assumed signal-to-noise (S/N) ratio, as for the commercial devices.

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 A stable and highly sensitive room-temperature liquefied petroleum gas sensor based on nano-cubes/cuboids of zinc antimonate

RSC Advances ◽  
2020 ◽  
Vol 10 (34) ◽  
pp. 20349-20357 ◽  
Author(s):  
Satyendra Singh ◽  
Archana Singh ◽  
Ajendra Singh ◽  
Poonam Tandon
Keyword(s):  
Gas Sensor ◽  
Room Temperature ◽  
Liquefied Petroleum Gas ◽  
Sensing Material ◽  
Highly Sensitive ◽  
Lpg Sensing

A new direction was explored using nanostructured zinc antimonate as a stable and highly sensitive LPG sensing material.

scholarly journals A highly sensitive ppb-level H2S gas sensor based on fluorophenoxy-substituted phthalocyanine cobalt/rGO hybrids at room temperature

RSC Advances ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 5993-6001
Author(s):  
Bin Wang ◽  
Xiaolin Wang ◽  
ZhiJiang Guo ◽  
Shijie Gai ◽  
Yong Li ◽  
...  
Keyword(s):  
Environmental Pollution ◽  
Gas Sensor ◽  
Room Temperature ◽  
Gas Sensing ◽  
Pollution Monitoring ◽  
Highly Sensitive ◽  
H2s Gas Sensor

Highly sensitive gas sensing materials are of great importance for environmental pollution monitoring.

scholarly journals Graphene derivative coated QCM-based gas sensor for volatile organic compound (VOC) detection at room temperature

2020 ◽  
Vol 18 (3) ◽  
pp. 1279
Author(s):  
Monika Gupta ◽  
Nurul Athirah ◽  
Huzein Fahmi Hawari
Keyword(s):  
Gas Sensor ◽  
Room Temperature ◽  
Building Materials ◽  
High Mobility ◽  
Fossil Fuel Burning ◽  
Sensing Material ◽  
Highly Sensitive ◽  
Volatile Organic ◽  
Response And Recovery ◽  
Hall Effect Measurements

<span>Volatile organic compounds (VOCs) affect our daily life through their emission from very common sources such as plants, building materials, paints, pesticides, and fossil fuel burning. The detection of VOCs at room temperature is a prime requirement. The graphene-based gas sensor has the potential to detect these VOC gases due to its attractive features such as high mobility and large surface area. In this work, a graphene-derivative is prepared as a sensing material in order to detect acetone. The thin film of graphene-derivative is prepared by a drop-cast method on a quartz crystal microbalance (QCM) sensor followed by drying in the room environment conditions. The prepared graphene-derivative and thin films are characterized structurally and morphologically by standard microscopic techniques such as FESEM, EDX, and Raman spectroscopy. The electrical parameters such as mobility and resistivity are measured using Hall-effect measurements at room temperature. The response and recovery time of the graphene-derivative based 10 MHz QCM sensor are found to be 23 s and 20 s, respectively. This highly sensitive graphene-based gas sensor with good reversibility can be employed for human health and environment safety applications. </span>

scholarly journals A high-sensitive room temperature gas sensor based on cobalt phthalocyanines and reduced graphene oxide nanohybrids for the ppb-levels of ammonia detection

RSC Advances ◽  
2019 ◽  
Vol 9 (64) ◽  
pp. 37518-37525 ◽  
Author(s):  
ZhiJiang Guo ◽  
Bin Wang ◽  
Xiaolin Wang ◽  
Yong Li ◽  
Shijie Gai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Environmental Pollution ◽  
Reduced Graphene Oxide ◽  
Gas Sensor ◽  
Room Temperature ◽  
Gas Sensing ◽  
Pollution Monitoring ◽  
Reduced Graphene ◽  
Highly Sensitive ◽  
Ammonia Detection

Highly sensitive gas sensing materials are of great importance for environmental pollution monitoring.

3D porous α-Ni(OH)2 nanostructure interconnected with carbon black as a high-performance gas sensing material for NO2 at room temperature

RSC Advances ◽  
2015 ◽  
Vol 5 (123) ◽  
pp. 101760-101767 ◽  
Author(s):  
Zhenyu Chu ◽  
Hongxin Sun ◽  
He Xu ◽  
Jiao Zhou ◽  
Guo Zhang ◽  
...  
Keyword(s):  
Detection Limit ◽  
Carbon Black ◽  
High Performance ◽  
Room Temperature ◽  
Gas Sensing ◽  
Fast Response ◽  
Sensing Properties ◽  
Low Detection Limit ◽  
Sensing Material

The 3D porous α-Ni(OH)2/carbon black nanostructure composites were fabricated via a simple refluxing method using SDBS as the template. The composites exhibited excellent sensing properties with fast response and low detection limit of NO2 at room temperature.

A Highly Efficient Volatile Organic Compounds Gas Sensor Based on Molybdenum Oxide Applied in Air Detection Inside Vehicles

2021 ◽  
Vol 16 (6) ◽  
pp. 993-997
Author(s):  
Jinying Zhou ◽  
Yan Liu ◽  
Lei Xu ◽  
Jun Long
Keyword(s):  
Volatile Organic Compounds ◽  
Gas Sensor ◽  
Organic Compounds ◽  
Gas Sensing ◽  
Structural Features ◽  
X Ray Diffraction ◽  
Sensing Material ◽  
Highly Sensitive ◽  
Volatile Organic ◽  
Promising Application

Volatile organic compounds (VOCs) are the major air pollutants inside vehicles. In this research, a highly sensitive gas sensor was developed based on an excellent sensing material and explored for VOCs sensing application. The X-ray diffraction and scanning electron microscopy were performed to evaluate the detailed structural features of sensing material. From the gas-sensing property tests to the three representative VOCs vapors, containing xylene, toluene and formaldehyde, the gas sensor fabricated from the exceptional sensing material significantly responses to the three VOCs vapors. In particular, the xylene response of the sensor is slightly larger than the other two gas response. Thus, the fabricated sensor could be a promising application for VOCs detection inside vehicles.

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