Synthesis of Polypyrrole/MoO3Hybrid Thin Films and Their Volatile Organic Compound Gas-Sensing Properties

2005 ◽  
Vol 17 (2) ◽  
pp. 349-354 ◽  
Author(s):  
Kouta Hosono ◽  
Ichiro Matsubara ◽  
Norimitsu Murayama ◽  
Shin Woosuck ◽  
Noriya Izu
Keyword(s):  
Thin Films ◽  
Organic Compound ◽  
Volatile Organic Compound ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Volatile Organic

Synthesis and VOC gas sensing properties of Polypyrrole / MoO3 Nanohybrids

2003 ◽  
Vol 785 ◽  
Author(s):  
Kouta Hosono ◽  
Ichiro Matsubara ◽  
Norimitsu Murayama ◽  
Shin Woosuck ◽  
Noriya Izu
Keyword(s):  
Thin Films ◽  
Organic Compound ◽  
Volatile Organic Compound ◽  
Crystallographic Orientation ◽  
Electrical Resistance ◽  
Gas Sensing ◽  
Sodium Ions ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Volatile Organic

ABSTRACTWe have prepared polypyrrole (PPy) / MoO3 nanohybrid thin films and evaluated their volatile organic compound (VOC) gas sensing properties. The (PPy)xMoO3 thin films have been prepared by intercalation reactions of highly oriented MoO3 thin films. Intercalation of hydrated sodium ions successfully proceeded without loosing the crystallographic orientation. The (PPy)xMoO3 thin films was obtained by replacing the hydrated sodium ions with PPy. The (PPy)xMoO3 thin films can detect formaldehyde gas by increasing in their electrical resistance, whereas they showed no response to toluene.

Hydrothermally synthesized CuO based volatile organic compound gas sensor

RSC Advances ◽  
2014 ◽  
Vol 4 (101) ◽  
pp. 57975-57982 ◽  
Author(s):  
Shufeng Xia ◽  
Huichao Zhu ◽  
Haitao Cai ◽  
Jiaqi Zhang ◽  
Jun Yu ◽  
...  
Keyword(s):  
Organic Compound ◽  
Hydrothermal Method ◽  
Gas Sensor ◽  
Volatile Organic Compound ◽  
Single Phase ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Volatile Organic

In the present work, single-phase CuO particles were synthesized by a hydrothermal method and characterized by SEM, TEM and XRD. The gas sensing properties of the CuO based sensor to some representative flammable VOC gases were investigated.

FILMS SPIN-COATED WITH GALLIC ACID AND THE DETECTION OF SPUN FILMS AGAINST VOLATILE ORGANIC COMPOUNDS

2019 ◽  
Vol 27 (02) ◽  
pp. 1950106
Author(s):  
SİBEL ŞEN
Keyword(s):  
Thin Films ◽  
Volatile Organic Compounds ◽  
Gallic Acid ◽  
Organic Compounds ◽  
Gas Sensing ◽  
Quartz Substrate ◽  
Methanol Vapor ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Volatile Organic

To determine thin films’ properties of commercially available gallic acid molecule, they were deposited onto a suitable substrate using spin coater. UV–Visible absorption spectroscopy and atomic force microscopy (AFM) were employed for the characterization of the deposited thin films. Characterization results obtained by these two techniques indicated that the gallic acid molecules are suitable for transfer onto a glass or quartz substrate. Gas-sensing properties and thickness of these thin films were elucidated using surface plasmon resonance (SPR). Thickness values of spun thin films were obtained at different spinning speeds. Then, the gas-sensing properties were examined by exposing them to the vapors of four volatile organic compounds (VOCs). It was found that the spun films of this material were selective for methanol vapor yielding rapid response and recovery time and thin films of gallic acid exhibited reversible changes in the optical behavior, which makes them suitable for practical methanol-detection applications.

scholarly journals Recent Advances in Silicon FET Devices for Gas and Volatile Organic Compound Sensing

Chemosensors ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 260
Author(s):  
Anwesha Mukherjee ◽  
Yossi Rosenwaks
Keyword(s):  
Organic Compound ◽  
Volatile Organic Compound ◽  
Gas Sensing ◽  
Field Effect Transistors ◽  
Medical Diagnostics ◽  
Silicon On Insulator ◽  
Oxide Semiconductor ◽  
Ultra Low Power ◽  
Sensing Properties ◽  
Volatile Organic

Highly sensitive and selective gas and volatile organic compound (VOC) sensor platforms with fast response and recovery kinetics are in high demand for environmental health monitoring, industry, and medical diagnostics. Among the various categories of gas sensors studied to date, field effect transistors (FETs) have proved to be an extremely efficient platform due to their miniaturized form factor, high sensitivity, and ultra-low power consumption. Despite the advent of various kinds of new materials, silicon (Si) still enjoys the advantages of excellent and reproducible electronic properties and compatibility with complementary metal–oxide–semiconductor (CMOS) technologies for integrated multiplexing and signal processing. This review gives an overview of the recent developments in Si FETs for gas and VOC sensing. We categorised the Si FETs into Si nanowire (NW) FETs; planar Si FETs, in which the Si channel is either a part of the silicon on insulator (SOI) or the bulk Si, as in conventional FETs; and electrostatically formed nanowire (EFN) FETs. The review begins with a brief introduction, followed by a description of the Si NW FET gas and VOC sensors. A brief description of the various fabrication strategies of Si NWs and the several functionalisation methods to improve the sensing performances of Si NWs are also provided. Although Si NW FETs have excellent sensing properties, they are far from practical realisation due to the extensive fabrication procedures involved, along with other issues that are critically assessed briefly. Then, we describe planar Si FET sensors, which are much closer to real-world implementation. Their simpler device architecture combined with excellent sensing properties enable them as an efficient platform for gas sensing. The third category, the EFN FET sensors, proved to be another potential platform for gas sensing due to their intriguing properties, which are elaborated in detail. Finally, the challenges and future opportunities for gas sensing are addressed.

Fabrication of Hierarchical SnO2 Nanocrystals and their Sensing Properties to Volatile Organic Compound Vapors

2011 ◽  
Vol 266 ◽  
pp. 1-4 ◽  
Author(s):  
De Liang Chen ◽  
Tao Li ◽  
Li Yin ◽  
Rui Zhang ◽  
Xin Jian Li
Keyword(s):  
Organic Compound ◽  
Volatile Organic Compound ◽  
Gas Sensing ◽  
Sno2 Nanostructures ◽  
X Ray Diffraction ◽  
Hierarchical Microstructure ◽  
X Ray ◽  
Sensing Properties ◽  
Volatile Organic ◽  
Sensing Performance

Hierarchical SnO2 (H-SnO2) and particulate SnO2 (P-SnO2) nanostructures were synthesized by a hydrothermal method with and without the aid of sodium 1-dodecanesulfonate (SDS), respectively. X-ray diffraction and scanning electron microscopy were used to characterize the products obtained. The sensing properties of the H-SnO2 and P-SnO2 nanostructures to volatile organic compound gas (VOCs) were measured. The H-SnO2 sensors show better gas-sensing performance than the P-SnO2 sensors due to the hierarchical microstructure.

Structural, morphological and gas sensing properties of Zn1−xSnxO thin films by SILAR method

2021 ◽  
Vol 127 (4) ◽  
Author(s):  
Irmak Karaduman Er ◽  
Memet Ali Yıldırım ◽  
H. Hasan Örkçü ◽  
Aytunç Ateş ◽  
Selim Acar
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Silar Method ◽  
Sensing Properties ◽  
Gas Sensing Properties

Polyaniline/SnO2 Nanocomposite Sensor for NO2 Gas Sensing at Low Operating Temperature

2015 ◽  
Vol 14 (04) ◽  
pp. 1550011 ◽  
Author(s):  
A. Sharma ◽  
M. Tomar ◽  
V. Gupta ◽  
A. Badola ◽  
N. Goswami
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
Sensing Properties ◽  
Response Recovery ◽  
Transmission Electron ◽  
Gas Sensing Properties

In this paper gas sensing properties of 0.5–3% polyaniline (PAni) doped SnO 2 thin films sensors prepared by chemical route have been studied towards the trace level detection of NO 2 gas. The structural, optical and surface morphological properties of the PAni doped SnO 2 thin films were investigated by performing X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Raman spectroscopy measurements. A good correlation has been identified between the microstructural and gas sensing properties of these prepared sensors. Out of these films, 1% PAni doped SnO 2 sensor showed high sensitivity towards NO 2 gas along with a sensitivity of 3.01 × 102 at 40°C for 10 ppm of gas. On exposure to NO 2 gas, resistance of all sensors increased to a large extent, even greater than three orders of magnitude. These changes in resistance upon removal of NO 2 gas are found to be reversible in nature and the prepared composite film sensors showed good sensitivity with relatively faster response/recovery speeds.

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