Hexanal Gas Detection Using Chitosan Biopolymer as Sensing Material at Room Temperature

Hexanal was identified as one of the major volatile gases which are produced in degraded dairy products and wood industries. Therefore, preliminary study on hexanal gas detection with the laboratory scale was carried out in this paper. Electrical testing with chitosan as a sensing material to sense hexanal gas in low concentration was carried out at room temperature. Chitosan sensor was fabricated by using electrochemical deposition technique to form active sensing layer. The response of the chitosan film sensor (CFS) towards hexanal was tested via electrical testing by exposing different hexanal concentrations ranging between 20 ppm, 100 ppm, 200 ppm, and 300 ppm using air as a carrier gas. Sensing properties of the CFS toward hexanal exposure including responsibility, recovery, repeatability, stability, and selectively were studied. Overall, our result suggested that hexanal sensor based on chitosan was able to perform well at room temperature demonstrated by good response, good recovery, good repeatability, good stability, and good selectively. This simple and low cost sensor has high potential to be utilized in early quality degradation detection in dairy products and can be used to monitor the level of hexanal exposure in wood industries.

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

Sensors ◽

10.3390/s18103542 ◽

2018 ◽

Vol 18 (10) ◽

pp. 3542 ◽

Cited By ~ 5

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.

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Ammonia Gas Detection by Tannic Acid Functionalized and Reduced Graphene Oxide at Room Temperature

Journal of Nanomaterials ◽

10.1155/2014/497384 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 40

Author(s):

Sweejiang Yoo ◽

Xin Li ◽

Yuan Wu ◽

Weihua Liu ◽

Xiaoli Wang ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Gas Sensor ◽

Tannic Acid ◽

Room Temperature ◽

Gas Sensing ◽

High Sensitivity ◽

Gas Detection ◽

Ammonia Gas ◽

Reduced Graphene

Reduced graphene oxide (rGO) based chemiresistor gas sensor has received much attention in gas sensing for high sensitivity, room temperature operation, and reversible. Here, for the first time, we present a promising chemiresistor for ammonia gas detection based on tannic acid (TA) functionalized and reduced graphene oxide (rGOTA functionalized). Green reductant of TA plays a major role in both reducing process and enhancing the gas sensing properties ofrGOTA functionalized. Our results showrGOTA functionalizedonly selective to ammonia with excellent respond, recovery, respond time, and recovery times.rGOTA functionalizedelectrical resistance decreases upon exposure to NH3where we postulated that it is due to n-doping by TA and charge transfer betweenrGOTA functionalizedand NH3through hydrogen bonding. Furthermore,rGOTA functionalizedhinders the needs for stimulus for both recovery and respond. The combination of greener sensing material and simplicity in overall sensor design provides a new sight for green reductant approach of rGO based chemiresistor gas sensor.

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Synthesis of g-C3N4-Decorated ZnO Porous Hollow Microspheres for Room-Temperature Detection of CH4 under UV-Light Illumination

Nanomaterials ◽

10.3390/nano9111507 ◽

2019 ◽

Vol 9 (11) ◽

pp. 1507 ◽

Cited By ~ 3

Author(s):

Min Xiao ◽

Yanwei Li ◽

Bo Zhang ◽

Guang Sun ◽

Zhanying Zhang

Keyword(s):

Room Temperature ◽

Gas Sensing ◽

Uv Light ◽

Response Speed ◽

Hollow Microspheres ◽

Oxide Semiconductor ◽

Light Illumination ◽

Long Term Stability ◽

Temperature Detection ◽

Good Repeatability

UV light-assisted gas sensors based on metal oxide semiconductor (MOS) have attracted much attention in detecting flammable and explosive gases at room temperature. In this paper, graphite-based carbon nitride (g-C3N4) nanosheets-decorated ZnO porous hollow microspheres (PHMSs) with the size about 3~5 μm in diameter were successfully synthesized by annealing the solvothermally-synthesized Zn5(CO3)2(OH)6 PHMSs together with g-C3N4. The synthesized samples were characterized by XRD, SEM, TEM, FT-IR and XPS. The results indicated that the prepared g-C3N4/ZnO PHMSs were constructed by numerous loosely stacked ZnO nanoparticles of 20~30 nm in diameter. Gas sensing tests indicated that under UV light (365~385 nm) illumination, the sensors fabricated with g-C3N4/ZnO HPMSs showed an enhanced response and faster response speed than the pure ZnO counterpart at room temperature. In addition, the g-C3N4/ZnO sensor also exhibited good repeatability and long-term stability for CH4 detection.

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Screen-Printed Graphite Electrodes as Low-Cost Devices for Oxygen Gas Detection in Room-Temperature Ionic Liquids

Sensors ◽

10.3390/s17122734 ◽

2017 ◽

Vol 17 (12) ◽

pp. 2734 ◽

Cited By ~ 8

Author(s):

Junqiao Lee ◽

Ghulam Hussain ◽

Craig Banks ◽

Debbie Silvester

Keyword(s):

Ionic Liquids ◽

Room Temperature ◽

Low Cost ◽

Gas Detection ◽

Room Temperature Ionic Liquids ◽

Graphite Electrodes ◽

Oxygen Gas ◽

Screen Printed

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Ammonia Gas Sensor Based on Chitosan Biopolymer

Materials Science Forum ◽

10.4028/www.scientific.net/msf.819.429 ◽

2015 ◽

Vol 819 ◽

pp. 429-434 ◽

Cited By ~ 2

Author(s):

Devi Shantini Chandrasakaran ◽

Irwana Nainggolan ◽

Tulus Ikhsan ◽

Mohd Nazree Derman

Keyword(s):

Chitosan Film ◽

Chitosan Solution ◽

Ammonia Concentration ◽

Structure Characterization ◽

Air Exposure ◽

Hazardous Chemical ◽

Sensing Material ◽

Sensor Properties ◽

Domain Functional ◽

Chitosan Biopolymer

Ammonia classified as one of the hazardous chemical to environment and human. Therefore, monitoring the ammonia in air is vital. Chitosan film was selected as a sensing material for ammonia detection in this study. Chitosan powder was dissolved in 2% of acetic acid to form chitosan solution gel. It was subsequently deposited on patterned electrode by using electrochemical deposition technique. The response of the chitosan sensor towards ammonia was tested via electrical testing by exposing different ammonia concentration ranging from 20 ppm, 100 ppm, 200 ppm, and 300 ppm using air exposure technique. The response of the chitosan sensor towards ammonia was recorded as output voltage. Sensor properties which include sensitivity, stability, recovery, and repeatability were studied. The electrical result showed that the response of chitosan sensor increases as the ammonia concentration increases. All the sensing properties were achieved. Finally, the structure characterization of the chitosan was studied using Fourier Transform Infrared Spectroscopy (FTIR). The appearance of N-H and O-H groups in FTIR spectrum of chitosan film provides evidence that the domain functional group exist in chitosan after it was processed into film.

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ZnO-Based Gas Sensors Prepared by EPD and Hydrothermal Growth

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.654.94 ◽

2015 ◽

Vol 654 ◽

pp. 94-98 ◽

Cited By ~ 2

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.

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Nanostructured cobalt antimonate: a fast responsive and highly stable sensing material for liquefied petroleum gas detection at room temperature

RSC Advances ◽

10.1039/d0ra06208a ◽

2020 ◽

Vol 10 (56) ◽

pp. 33770-33781

Author(s):

Satyendra Singh ◽

Archana Singh ◽

Ajendra Singh ◽

Sanjeev Rathore ◽

B. C. Yadav ◽

...

Keyword(s):

Electrical Resistance ◽

Room Temperature ◽

Gas Detection ◽

Liquefied Petroleum Gas ◽

Sensing Material

Modulation in electrical resistance of the sensing layer due to interaction (adsorption and reactions) with LPG.

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Synthesis of NiO@CuO nanocomposite as high-performance gas sensing material for NO 2 at room temperature

Applied Surface Science ◽

10.1016/j.apsusc.2017.03.213 ◽

2017 ◽

Vol 412 ◽

pp. 230-237 ◽

Cited By ~ 28

Author(s):

He Xu ◽

Jiawei Zhang ◽

Afrasiab Ur Rehman ◽

Lihong Gong ◽

Kan Kan ◽

...

Keyword(s):

High Performance ◽

Room Temperature ◽

Gas Sensing ◽

Sensing Material

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ROOM TEMPERATURE AND ELEVATED TEMPERATURE CHARACTERIZATION OF NANOCRYSTALLINE SnO2 SURFACES BY SCANNING TUNNELING MICROSCOPY AND SPECTROSCOPY

International Journal of Nanoscience ◽

10.1142/s0219581x04002322 ◽

2004 ◽

Vol 03 (04n05) ◽

pp. 519-524

Author(s):

T. G. G. MAFFEÏS ◽

G. T. OWEN ◽

S. P. WILKS ◽

C. MALAGÙ ◽

G. MARTINELLI ◽

...

Keyword(s):

Scanning Tunneling Microscopy ◽

Band Gap ◽

Surface Properties ◽

Room Temperature ◽

Gas Sensing ◽

Low Cost ◽

Scanning Tunneling ◽

Full Potential ◽

Tunneling Microscopy ◽

Sensing Applications

Semiconductor gas sensors based on nanocrystalline SnO 2 offer many advantages over current technologies for detecting reducing gases, such as low cost, long lifetime, and high selectivity and sensitivity. However, the local surface properties on the nanoscale of SnO 2 nanocrystals are not fully understood, which impedes the exploitation of the full potential of SnO 2 for gas sensing applications. In this paper, we present a scanning tunneling microscopy and spectroscopy (STM/STS) study of nanocrystalline SnO 2 at room temperature, and under standard sensing conditions at 120°C. STS data indicate that the electronic surface properties change with nanoparticle size, temperature and exposure to gas. The surface density of states in the band gap is shown to increase with temperature while CO exposures induce a large drop in the density of band gap states as the CO molecules react with chemisorbed oxygen species.

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Berlin Green Framework-Based Gas Sensor for Room-Temperature and High-Selectivity Detection of Ammonia

Nano-Micro Letters ◽

10.1007/s40820-020-00586-z ◽

2021 ◽

Vol 13 (1) ◽

Author(s):

Tingqiang Yang ◽

Lingfeng Gao ◽

Wenxuan Wang ◽

Jianlong Kang ◽

Guanghui Zhao ◽

...

Keyword(s):

High Resistance ◽

Active Sites ◽

Density Functional ◽

Room Temperature ◽

High Selectivity ◽

Gas Sensing ◽

Response Recovery ◽

Sensing Material ◽

Agriculture Industry ◽

Ammonia Detection

AbstractAmmonia detection possesses great potential in atmosphere environmental protection, agriculture, industry, and rapid medical diagnosis. However, it still remains a great challenge to balance the sensitivity, selectivity, working temperature, and response/recovery speed. In this work, Berlin green (BG) framework is demonstrated as a highly promising sensing material for ammonia detection by both density functional theory simulation and experimental gas sensing investigation. Vacancy in BG framework offers abundant active sites for ammonia absorption, and the absorbed ammonia transfers sufficient electron to BG, arousing remarkable enhancement of resistance. Pristine BG framework shows remarkable response to ammonia at 50–110 °C with the highest response at 80 °C, which is jointly influenced by ammonia's absorption onto BG surface and insertion into BG lattice. The sensing performance of BG can hardly be achieved at room temperature due to its high resistance. Introduction of conductive Ti3CN MXene overcomes the high resistance of pure BG framework, and the simply prepared BG/Ti3CN mixture shows high selectivity to ammonia at room temperature with satisfying response/recovery speed.

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