scholarly journals Design and Synthesis of Novel 2D Porous Zinc Oxide-Nickel Oxide Composite Nanosheets for Detecting Ethanol Vapor

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1989
Author(s):  
Yuan-Chang Liang ◽  
Yen-Cheng Chang ◽  
Wei-Cheng Zhao
Keyword(s):  
Zinc Oxide ◽  
Nickel Oxide ◽  
Active Sites ◽  
Gas Sensing ◽  
Ethanol Vapor ◽  
Gas Diffusion ◽  
High Specific Surface Area ◽  
Sputtering Deposition ◽  
Vapor Sensing ◽  
Sensing Performance

The porous zinc oxide-nickel oxide (ZnO-NiO) composite nanosheets were synthesized via sputtering deposition of NiO thin film on the porous ZnO nanosheet templates. Various NiO film coverage sizes on porous ZnO nanosheet templates were achieved by changing NiO sputtering duration in this study. The microstructures of the porous ZnO-NiO composite nanosheets were investigated herein. The rugged surface feature of the porous ZnO-NiO composite nanosheets were formed and thicker NiO coverage layer narrowed the pore size on the ZnO nanosheet template. The gas sensors based on the porous ZnO-NiO composite nanosheets displayed higher sensing responses to ethanol vapor in comparison with the pristine ZnO template at the given target gas concentrations. Furthermore, the porous ZnO-NiO composite nanosheets with the suitable NiO coverage content demonstrated superior gas-sensing performance towards 50–750 ppm ethanol vapor. The observed ethanol vapor-sensing performance might be attributed to suitable ZnO/NiO heterojunction numbers and unique porous nanosheet structure with a high specific surface area, providing abundant active sites on the surface and numerous gas diffusion channels for the ethanol vapor molecules. This study demonstrated that coating of NiO on the porous ZnO nanosheet template with a suitable coverage size via sputtering deposition is a promising route to fabricate porous ZnO-NiO composite nanosheets with a high ethanol vapor sensing ability.

Copper oxide hierarchical morphology derived from MOF precursors for enhancing ethanol vapor sensing performance

2020 ◽  
Vol 8 (28) ◽  
pp. 9671-9677 ◽  
Author(s):  
Sha Wang ◽  
Zhimin Gao ◽  
Guoshuai Song ◽  
Yantao Yu ◽  
Wenxiu He ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Structure Function ◽  
Gas Sensing ◽  
Ethanol Vapor ◽  
Vapor Sensing ◽  
Structure Function Relationship ◽  
Function Relationship ◽  
Relationship Of ◽  
Hierarchical Morphology ◽  
Sensing Performance

The structure–function relationship of CuO hierarchical morphologies in gas sensing has been revealed.

scholarly journals ZnO/RGO Heterojunction Based near Room Temperature Alcohol SENSOR with Improved Efficiency

2021 ◽  
Vol 6 (1) ◽  
pp. 25
Author(s):  
Sanghamitra Ghosal ◽  
Partha Bhattacharyya
Keyword(s):  
Active Sites ◽  
Room Temperature ◽  
Surface Engineering ◽  
Gas Sensing ◽  
Energy Band Diagram ◽  
Future Generation ◽  
High Yield ◽  
Synthesis Process ◽  
Ethanol Sensor ◽  
Vapor Sensing

The systematic optimization of surface engineering (dimensionality) indeed plays a crucial role in achieving efficient vapor-sensing performance. Among various semiconducting metal oxides, owing to some of its unique features and advantages, ZnO has attracted researchers on a global scale due to its application in various fields, including chemical sensors. The concomitant optimization of the surface attributes (varying different dimensions) of ZnO have become a sensation for the entire research community. Moreover, the small thickness and extremely large surface of exfoliated 2D nanosheets render the gas sensing material an ideal candidate for achieving strong coupling with different gas molecules. However, temperature is a crucial factor in the field of chemical sensing. Recently, graphene-based gas sensors have attracted attention due to their variety of structures, unique sensing performances and room temperature working conditions. In this work, a highly sensitive and fast responsive low temperature (60 °C)-based ethanol sensor, based on RGO/2D ZnO nanosheets hybrid structure, is reported. After detailed characterizations, the vapor sensing potentiality of this sensor was tested for the detection of ethanol. The ethanol sensor offered the response magnitude of 89% (100 ppm concentration) with response and recovery time of 12 s/29 s, respectively. Due to excessively high number of active sites for VOC interaction, with high yield synthesis process and appreciably high carrier mobility, this has paved the way for developing future generation, miniaturized and flexible (wearable) vapor sensor devices, meeting the multidimensional requirements for traditional and upcoming (health/medical sector) applications. The underlying mechanistic framework for vapor sensing, using this hybrid junction, is explained with the Energy Band Diagram.

scholarly journals Breakthroughs in the Design of Novel Carbon-Based Metal Oxides Nanocomposites for VOCs Gas Sensing

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1485 ◽  
Author(s):  
Eleonora Pargoletti ◽  
Giuseppe Cappelletti
Keyword(s):  
Graphene Oxide ◽  
Active Sites ◽  
Gas Sensing ◽  
Spillover Effect ◽  
Gas Diffusion ◽  
Hybrid Features ◽  
Multi Wall Carbon Nanotubes ◽  
Recovery Times ◽  
Electron Migration ◽  
Carbon Based

Nowadays, the detection of volatile organic compounds (VOCs) at trace levels (down to ppb) is feasible by exploiting ultra-sensitive and highly selective chemoresistors, especially in the field of medical diagnosis. By coupling metal oxide semiconductors (MOS e.g., SnO2, ZnO, WO3, CuO, TiO2 and Fe2O3) with innovative carbon-based materials (graphene, graphene oxide, reduced graphene oxide, single-wall and multi-wall carbon nanotubes), outstanding performances in terms of sensitivity, selectivity, limits of detection, response and recovery times towards specific gaseous targets (such as ethanol, acetone, formaldehyde and aromatic compounds) can be easily achieved. Notably, carbonaceous species, highly interconnected to MOS nanoparticles, enhance the sensor responses by (i) increasing the surface area and the pore content, (ii) favoring the electron migration, the transfer efficiency (spillover effect) and gas diffusion rate, (iii) promoting the active sites concomitantly limiting the nanopowders agglomeration; and (iv) forming nano-heterojunctions. Herein, the aim of the present review is to highlight the above-mentioned hybrid features in order to engineer novel flexible, miniaturized and low working temperature sensors, able to detect specific VOC biomarkers of a human’s disease.

Enhanced gas sensing performance of indium doped zinc oxide nanopowders

RSC Advances ◽  
2015 ◽  
Vol 5 (104) ◽  
pp. 85767-85774 ◽  
Author(s):  
David C. Pugh ◽  
Vandna Luthra ◽  
Anita Singh ◽  
Ivan P. Parkin
Keyword(s):  
Zinc Oxide ◽  
Gas Sensing ◽  
Sensing Performance

Indium doped zinc oxide sensors were synthesised, characterised and tested towards a range of gases, displaying particular sensitivity to ethanol.

Enhanced NO2 sensing performance of S-doped biomorphic SnO2 with increased active sites and charge transfer at room temperature

2020 ◽  
Vol 7 (10) ◽  
pp. 2031-2042
Author(s):  
Wenna Li ◽  
Lang He ◽  
Xue Bai ◽  
Lujia Liu ◽  
Muhammad Ikram ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Active Sites ◽  
Room Temperature ◽  
Gas Sensing ◽  
Chemical Bonds ◽  
Sensing Performance

S-Doped biomorphic SnO2 with active S-terminations and S–Sn–O chemical bonds has significantly improved gas sensing performance to NO2 at room temperature.

Template-free preparation of mesoporous single crystal In2O3 achieving superior ethanol gas sensing performance

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 14615-14619 ◽  
Author(s):  
Jijiang Liu ◽  
Gang Chen ◽  
Yaoguang Yu ◽  
Yalin Wu ◽  
Mingjun Zhou ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Specific Surface ◽  
Single Crystal ◽  
Surface Area ◽  
Gas Sensing ◽  
Vacancy Concentration ◽  
High Specific Surface Area ◽  
Oxygen Vacancy Concentration ◽  
Template Free ◽  
Sensing Performance

Mesoporous single crystal In2O3 with high specific surface area and oxygen vacancy concentration are prepared for enhanced ethanol gas sensing performance.

scholarly journals Gas sensing performance of Sol-gel grown NiO-doped Cr2O3 nanoparticles

2018 ◽  
Vol 16 (37) ◽  
pp. 15-22
Author(s):  
Tunis B. Hassan
Keyword(s):  
Nickel Oxide ◽  
Recovery Time ◽  
Screen Printing ◽  
Gas Sensing ◽  
Sol Gel ◽  
Sensor Element ◽  
Cr2o3 Nanoparticles ◽  
Response And Recovery ◽  
Nh3 Sensor ◽  
Sensing Performance

The sensors based on Nickel oxide doped chromic oxide (NiO: Cr2O3) nanoparticals were fabricated using thick-film screen printing of sol-gel grown powders. The structural, morphological investigations were carried out using XRD, AFM, and FESEM. Furthermore, the gas responsivity were evaluated towards the NH3 and NO2 gas. The NiO0.10: Cr2O3 nanoparticles exhibited excellent response of 95 % at 100oC and better selectivity towards NH3 with low response and recovery time as compared to pure Cr2O3 and can stand as reliable sensor element for NH3 sensor related applications.

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