scholarly journals Zinc Phthalocyanine Thin Film-Based Optical Waveguide H2S Gas Sensor

2021 ◽  
Author(s):  
Kediliya Wumaier ◽  
Gulgina Mamtmin ◽  
Qingrong Ma ◽  
Asiya Maimaiti ◽  
Patima Nizamidin ◽  
...  
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Optical Waveguide ◽  
Gas Sensors ◽  
Room Temperature ◽  
Detection System ◽  
Cost Effective ◽  
Zinc Phthalocyanine ◽  
Highly Sensitive ◽  
H2s Gas Sensor

AbstractThe detection of hydrogen sulfide (H2S) is essential because of its toxicity and abundance in the environment. Hence, there is an urgent requisite to develop a highly sensitive and economical H2S detection system. Herein, a zinc phthalocyanine (ZnPc) thin film-based K+-exchanged optical waveguide (OWG) gas sensor was developed for H2S detection by using spin coating. The sensor showed excellent H2S sensing performance at room temperature with a wide linear range (0.1 ppm–500 ppm), reproducibility, stability, and a low detection limit of 0.1 ppm. The developed sensor showed a significant prospect in the development of cost-effective and highly sensitive H2S gas sensors.

Highly sensitive thin film NH3 gas sensor operating at room temperature based on SnO2/MWCNTs composite

2008 ◽  
Vol 129 (2) ◽  
pp. 888-895 ◽  
Author(s):  
Nguyen Van Hieu ◽  
Luong Thi Bich Thuy ◽  
Nguyen Duc Chien
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Room Temperature ◽  
Highly Sensitive

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.

Highly sensitive and selective H2S gas sensor from r.f. sputtered SnO2 thin film

1995 ◽  
Vol 25 (1-3) ◽  
pp. 433-437 ◽  
Author(s):  
Tadashi Mochida ◽  
Kei Kikuchi ◽  
Takehiko Kondo ◽  
Hironobu Ueno ◽  
Yoshinobu Matsuura
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Sno2 Thin Film ◽  
Highly Sensitive ◽  
H2s Gas Sensor

Properties of gas sensor using CNTs thin film prepared by PLD/CVD method

2005 ◽  
Vol 900 ◽  
Author(s):  
Tsuyoshi Ueda ◽  
Hideyuki Norimatsu ◽  
M.M.H. Bhuiyan ◽  
Tomoaki Ikegami ◽  
Kenji Ebihara
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Room Temperature ◽  
Catalyst Particle ◽  
High Sensitivity ◽  
Laser Pulses ◽  
Nano Particles ◽  
Film Sensor ◽  
Cvd Method

ABSTRACTCarbon nanotube (CNT) is a promising material which has potential for applications to various nanotechnology devices owing to its unique features like high electrical conductivity, mechanical strength and large specific surface area. Recently, gas sensors using CNTs or carbon nano-fiber, which have extremely high sensitivity at a room temperature with fast response, have been reported. Being exposed to oxidizing gas like NO, NO2 or O3, the conductance of the single-walled carbon nanotubes (SWNTs) changes due to charge transfer between the SWNT surface and gas molecules adsorbed. Therefore CNTs will be applicable to O2 and O3 gas sensors in various fields.CNTs thin film sensor was prepared and its performance was investigated. CNTs thin film was prepared on a SiN substrate using PLD/CVD method. To prepare a sensor device an Al2O3 substrate with Pt interdigital electrodes (sensor substrate) was used. In this method, Fe catalytic thin film was deposited by pulsed laser deposition (PLD) method using KrF excimer laser of wavelength 248 nm, repetition rate 10 Hz, energy fluence 3 J/cm2. During PLD process the substrate temperature and the ambient gas pressure were kept at room temperature of 25 °C and 3.5×10−5 Torr, respectively. The thickness and roughness of the films were modified by changing a number of ablation laser pulses from 300 to 3,000. A small number of laser pulses deposited Fe nano-particles of less than 10 nm in diameter on the substrate. We used 1000 pulses for a catalytic Fe film preparation as small-sized catalyst is necessary to grow SWNTs. CNTs were grown from Fe thin film on Si or sensor substrates by thermal CVD method. Ethylene gas was used as carbon source. The substrate was set in the quartz reaction tube heated to 1000 °C in an electric furnace. CNTs were grown for 20 ∼ 40 minutes. In our previous studies, it was found that SWNTs can grow under this process. The prepared CNTs were characterized using SEM, TEM and Raman spectroscopy. From SEM observation, randomly oriented CNTs were found on both the Si substrate and the sensor substrate. A diameter of CNTs was found 20 ∼ 50 nm which tended to be proportional to the size of catalyst particle.The Sensitivity of CNT gas sensor was evaluated by measuring the electrical characteristic of the sensor. The sensor was exposed to NO gas of different concentration in a chamber. Resistance of the sensor was measured by two-terminal method, while the sensor was heated from room temperature to a high temperature on a block heater. The Sensitivity of CNT gas sensors, response time and reproducibility was measured. Initial resistance of the film was about 450 and it decreases with temperature increase. This shows that a prepared CNTs sensor film has semiconductor characteristics. Measured maximum sensitivity of CNTs gas sensor was 6.9 % at sensor temperature 290 deg. Detail studies and the latest data will be presented at the symposium.

A highly sensitive room temperature H2S gas sensor based on SnO2 multi-tube arrays bio-templated from insect bristles

2015 ◽  
Vol 44 (17) ◽  
pp. 7911-7916 ◽  
Author(s):  
Junlong Tian ◽  
Feng Pan ◽  
Ruiyang Xue ◽  
Wang Zhang ◽  
Xiaotian Fang ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Tin Oxide ◽  
Room Temperature ◽  
High Sensitivity ◽  
Highly Sensitive ◽  
Tube Arrays ◽  
H2s Gas Sensor ◽  
Parallel Effect

A tin oxide multi-tube array with a parallel effect was fabricated, which exhibited high sensitivity to H2S gas at room temperature.

Ternary CuO:SnO2:ZnO (1:1:1) composite thin film for room temperature gas sensor application

Optik ◽  
2021 ◽  
Vol 234 ◽  
pp. 166615
Author(s):  
S.R. Cynthia ◽  
R. Sivakumar ◽  
C. Sanjeeviraja
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Room Temperature ◽  
Composite Thin Film ◽  
Sensor Application

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.

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