scholarly journals Special Issue “Advanced Materials for Gas Sensors”

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6765
Author(s):  
Cristian E. Simion
Keyword(s):  
Gas Sensors ◽  
High Sensitivity ◽  
Fast Response ◽  
Advanced Materials ◽  
Low Power Consumption ◽  
Special Issue ◽  
Time Stability ◽  
Response Recovery ◽  
Device Integration ◽  
Long Time

Today’s view on gas sensors end-users is more directed toward miniaturization, low power consumption, and intelligent device integration aiming to reply to several hot issues such as high sensitivity, optimum selectivity, fast response/recovery transients, and good long time stability [...]

scholarly journals Doubly resonant sub-ppt photoacoustic gas detection with eight decades dynamic range

2021 ◽  
Author(s):  
Zhen Wang ◽  
Hui Zhang ◽  
Qiang Wang ◽  
Simone Borri ◽  
Iacopo Galli ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Near Infrared ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Fast Response ◽  
Wide Dynamic Range ◽  
Acoustic Resonators ◽  
Light Waves ◽  
Energy Environment ◽  
Small Footprint

Abstract Gas sensors with high sensitivity, wide dynamic range, high selectivity, fast response, and small footprint are desirable across a broad range of applications in energy, environment, safety, and public health. However, designing a compact gas sensor with ultra-high sensitivity and ultra-wide dynamic range remains a challenge. Laser-based photoacoustic spectroscopy (PAS) is a promising candidate to fill this gap. Herein, we report a novel method to simultaneously enhance the acoustic and light waves for PAS using integrated optical and acoustic resonators. This increases sensitivity by more than two orders of magnitude and extends the dynamic range by more than three orders of magnitude, compared with the state-of-the-art photoacoustic gas sensors. We demonstrate the concept by exploiting a near-infrared absorption line of acetylene (C2H2) at 1531.59 nm, achieving a detection limit of 0.5 parts-per-trillion (ppt), a noise equivalent absorption (NEA) of 5.7×10-13 cm-1 and a linear dynamic range of eight orders of magnitude. This study enables the realization of compact ultra-sensitive and ultra-wide-dynamic-range gas sensors in a number of different fields.

scholarly journals Gas Sensors Based on Chemi-Resistive Hybrid Functional Nanomaterials

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yingying Jian ◽  
Wenwen Hu ◽  
Zhenhuan Zhao ◽  
Pengfei Cheng ◽  
Hossam Haick ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Carrier Transport ◽  
Gas Sensing ◽  
Low Cost ◽  
Functional Materials ◽  
Fast Response ◽  
Hybrid Functional ◽  
Great Stability ◽  
Molecular Binding ◽  
Response Recovery

AbstractChemi-resistive sensors based on hybrid functional materials are promising candidates for gas sensing with high responsivity, good selectivity, fast response/recovery, great stability/repeatability, room-working temperature, low cost, and easy-to-fabricate, for versatile applications. This progress report reviews the advantages and advances of these sensing structures compared with the single constituent, according to five main sensing forms: manipulating/constructing heterojunctions, catalytic reaction, charge transfer, charge carrier transport, molecular binding/sieving, and their combinations. Promises and challenges of the advances of each form are presented and discussed. Critical thinking and ideas regarding the orientation of the development of hybrid material-based gas sensor in the future are discussed.

A New Hydrogen Peroxide Biosensor Based on Hrp/Ag Nanowires/Glassy Carbon Electrode

2011 ◽  
Vol 110-116 ◽  
pp. 577-584
Author(s):  
Min Zhang ◽  
Fa Liang Cheng ◽  
Zhi Quan Cai ◽  
Mei Qiong Chen
Keyword(s):  
Fast Response ◽  
Carbon Electrode ◽  
Time Stability ◽  
Enzyme Loading ◽  
X Ray ◽  
H2o2 Detection ◽  
Ag Nanowires ◽  
Long Time ◽  
Optimized Conditions ◽  
Scanning Electron

An amperometric biosensor for H2O2 detection was developed with immobilization of Horseradish Peroxidase (HRP) on Ag nanowires (AgNWs). Ag nanowires (AgNWs) have been prepared by the reductive deposition method and characterized by the scanning electron microscopy (SEM) and the energy dispersive X-ray (EDX). The electrochemical performance of the HRP/AgNWs/GC electrode was investigated by cyclic voltammetry (CV) and chronoamperometry and the use of Ag nanowires led to an efficient enzyme loading, and also provided an increased surface area for sensing the reaction, showing high electrocatalytic activity towards the reduction of H2O2. Under the optimized conditions, the response of the biosensor towards H2O2 was investigated by chronoamperometry. The biosensor exhibited excellent sensitivity (the detection limit was down to 0.005 mM), fast response time (15 sec). Moreover, the biosensor had long-time stability and good reproducibility.

Vertical SnO2 nanosheet@SiC nanofibers with hierarchical architecture for high-performance gas sensors

2016 ◽  
Vol 4 (2) ◽  
pp. 295-304 ◽  
Author(s):  
Bing Wang ◽  
Yingde Wang ◽  
Yongpeng Lei ◽  
Song Xie ◽  
Nan Wu ◽  
...  
Keyword(s):  
High Temperature ◽  
Gas Sensors ◽  
High Performance ◽  
High Sensitivity ◽  
Hierarchical Architecture ◽  
Long Term Stability ◽  
Response Recovery ◽  
Sno2 Nanosheet ◽  
Excellent Reproducibility

The SnO2 NS@SiC NF sensor shows an ultrafast response/recovery rate, high sensitivity, excellent reproducibility, good sensing selectivity and outstanding long-term stability toward ethanol, even at high temperature.

Fast-response and high sensitivity gas sensors based on SnO2 hollow spheres

2008 ◽  
Vol 516 (21) ◽  
pp. 7840-7843 ◽  
Author(s):  
Yu Tan ◽  
Chengchao Li ◽  
Yong Wang ◽  
Jianfeng Tang ◽  
Xicheng Ouyang
Keyword(s):  
Gas Sensors ◽  
Hollow Spheres ◽  
High Sensitivity ◽  
Fast Response

Study of Sensitivity of Porous Thick-Film Elements Based on SnO2 towards Hydrogen Concentration in Air

2020 ◽  
Vol 25 (6) ◽  
pp. 539-547
Author(s):  
V.V. Amelichev ◽  
◽  
S.S. Generalov ◽  
A.V. Nikolaeva ◽  
S.A. Polomoshnov ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
Porous Metal ◽  
High Sensitivity ◽  
Fast Response ◽  
Gas Composition ◽  
Sensitive Layer ◽  
Initial Suspension ◽  
Semiconductor Gas Sensors ◽  
Manufacturing Technologies

The semiconductor gas sensors with low power consumption have high sensitivity and fast response and their manufacturing technologies permit to reduce the dimensions of the transducer. In production of the semiconductor gas sensors the formation of metal-oxide sensitive layer is an important issue, in particular, the process of combination of the high-porous metal-oxide layer and integrated structures. In the paper, the results of the study on experimental transducers of the composition of gas with porous gas-sensitive layer have been presented. The gas-sensitive layer has been formed by the method of suspension inkjet printing of SnO based suspension with further annealing. The comparison of the sensitivity of the experimental samples of the gas composition transducers with the gas-sensitive layers, formed from two variants of initial suspension: based on pure SnO and SnO doped with Cr and Nb, has been performed. The dependence of variation of conductivity of the gas composition of the integrated transducer specimen on the H concentration in the air has been obtained. It has been found that the gas-sensitive layer based on SnO with Cr and Nb additives has higher sensitivity to changes in the detected gas concentration due to higher effective surface area and suppressed grains agglomeration.

Highly selective and sensitive chemoresistive humidity sensors based on rGO/MoS2 van der Waals composites

2018 ◽  
Vol 6 (12) ◽  
pp. 5016-5024 ◽  
Author(s):  
Seo Yun Park ◽  
Yeon Hoo Kim ◽  
Seon Yong Lee ◽  
Woonbae Sohn ◽  
Jung Eun Lee ◽  
...  
Keyword(s):  
Hybrid Composites ◽  
Van Der Waals ◽  
High Sensitivity ◽  
Fast Response ◽  
Humidity Sensors ◽  
Good Reliability ◽  
Response Recovery

Sensors based on 2D rGO/2D MoS2 van der Waals hybrid composites exhibited high sensitivity, extreme selectivity, fast response/recovery, and good reliability to humidity detection.

scholarly journals Humidity Sensors with Shielding Electrode Under Interdigitated Electrode

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 659 ◽  
Author(s):  
Hong Liu ◽  
Qi Wang ◽  
Wenjie Sheng ◽  
Xubo Wang ◽  
Kaidi Zhang ◽  
...  
Keyword(s):  
Humidity Sensor ◽  
High Sensitivity ◽  
Fast Response ◽  
Capacitive Sensors ◽  
Humidity Sensors ◽  
Interdigitated Electrode ◽  
Response Recovery ◽  
Chip Fabrication ◽  
Good Agreement ◽  
Capacitive Humidity Sensor

Recently, humidity sensors have been investigated extensively due to their broad applications in chip fabrication, health care, agriculture, amongst others. We propose a capacitive humidity sensor with a shielding electrode under the interdigitated electrode (SIDE) based on polyimide (PI). Thanks to the shielding electrode, this humidity sensor combines the high sensitivity of parallel plate capacitive sensors and the fast response of interdigitated electrode capacitive sensors. We use COMSOL Multiphysics to design and optimize the SIDE structure. The experimental data show very good agreement with the simulation. The sensitivity of the SIDE sensor is 0.0063% ± 0.0002% RH. Its response/recovery time is 20 s/22 s. The maximum capacitance drift under different relative humidity is 1.28% RH.

scholarly journals Hydrogen Gas Sensing Using Palladium-Graphene Nanocomposite Material Based on Surface Acoustic Wave

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Nguyen Hai Ha ◽  
Nguyen Hoang Nam ◽  
Dang Duc Dung ◽  
Nguyen Huy Phuong ◽  
Phan Duy Thach ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Gas Sensing ◽  
Specific Interaction ◽  
High Sensitivity ◽  
Fast Response ◽  
Hydrogen Gas ◽  
Chemical Route ◽  
Response Recovery ◽  
Sensing Material

We report the fabrication and characterization of surface acoustic wave (SAW) hydrogen sensors using palladium-graphene (Pd-Gr) nanocomposite as sensing material. The Pd-Gr nanocomposite as sensing layer was deposited onto SAW delay line sensor-based interdigitated electrodes (IDTs)/aluminum nitride (AlN)/silicon (Si) structure. The Pd-Gr nanocomposite was synthesized by a chemical route and deposited onto SAW sensors by air-brush spraying. The SAW H2 sensor using Pd-Gr nanocomposite as a sensing layer shows a frequency shift of 25 kHz in 0.5% H2 concentration at room temperature with good repeatability and stability. Moreover, the sensor showed good linearity and fast response/recovery within ten seconds with various H2 concentrations from 0.25 to 1%. The specific interaction between graphene and SAW transfer inside AlN/Si structures yields a high sensitivity and fast response/recovery of SAW H2 sensor based on Pd-Gr/AlN/Si structure.

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