scholarly journals Incorporation of Au Nanoparticles on ZnO/ZnS Core Shell Nanostructures for UV Light/Hydrogen Gas Dual Sensing Enhancement

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 903
Author(s):  
Yu-Sheng Tsai ◽  
Deng-Yi Wang ◽  
Jia-Jie Chang ◽  
Keng-Tien Liang ◽  
Ya-Hsuan Lin ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Uv Light ◽  
Hydrogen Gas ◽  
Core Shell ◽  
Gas Sensitivity ◽  
Au Nps ◽  
Light Sensing ◽  
Shell Nanostructures ◽  
Compact Size ◽  
Dual Sensing

ZnO/ZnS nanocomposite-based nanostructures exhibit dual light and gas sensing capabilities. To further boost the light/dual sensing properties, gold nanoparticles (Au NPs) were incorporated into the core-shell structures. Multiple material characterizations revealed that Au NPs were successfully well spread and decorated on ZnO/ZnS nanostructures. Furthermore, our findings show that the addition of Au NPs could enhance both 365 nm UV light sensing and hydrogen gas sensing in terms of light/gas sensitivity and light/gas response time. We postulate that the optimization of gas/light dual sensing capability may result from the induced electric field and inhabitation of electron-hole recombination. Owing to their compact size, simple fabrication, and stable response, ZnO/ZnS/Au NPs-based light/gas dual sensors are promising for future extreme environmental monitoring.

ZnO/ZnS core-shell nanostructures for hydrogen gas sensing performances

2019 ◽  
Vol 45 (14) ◽  
pp. 17751-17757 ◽  
Author(s):  
Yu-Sheng Tsai ◽  
Tsung-Wei Chou ◽  
Chun Yu Xu ◽  
Wen Chang Huang ◽  
Chia Feng Lin ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Hydrogen Gas ◽  
Core Shell ◽  
Shell Nanostructures

Preparation of CNTs/PANi Core/Shell-Structured Nanowires and Improvement of Sensitivity of Chemical Sensors

2011 ◽  
Vol 686 ◽  
pp. 438-447
Author(s):  
Xing Fa Ma ◽  
Shu Juan Niu ◽  
Ming Jun Gao ◽  
Xiao Chun He ◽  
Guang Li
Keyword(s):  
Carbon Nanotube ◽  
Chemical Sensors ◽  
Gas Sensing ◽  
In Situ Polymerization ◽  
Core Shell ◽  
Gas Sensitivity ◽  
Flexible Polymer ◽  
Transmission Electron ◽  
Potential Applications ◽  
The Fourier Transform

In order to improve the sensing-properties of carbon nanotube based composite for potential applications in chemical sensors, CNTs/PANi core/shell-structured nanowires were prepared with in-situ polymerization approach. A series of characterizations was carried out by TEM (transmission electron microscopy), the Fourier-Transform Infrared (FTIR) spectra, and so on. A chemical prototype sensor was constructed based on CNTs/PANi core/shell-structured nanowires and interdigital-structured electrodes on flexible polymer substrate. The gas-sensing behaviors of the sensor to some gases operating at room temperature were examined. Results showed that the sensitivity of CNTs/PANi core/shell-structured nanowires was increased dramaticly compared with pure carbon nanotube materials. This provides a carbon nanotube based composite materials with enhanced gas-sensitivity, which would have potential applications in some chemical sensors.

Gold coated iron oxide core shell nanostructures for oxidation of indoles and synthesis of uracil-derived spirooxindoles

2022 ◽  
Author(s):  
Shivanee Borpatra Gohain ◽  
Purna K Boruah ◽  
Manash Ranjan Das ◽  
Ashim Jyoti Thakur
Keyword(s):  
Iron Oxide ◽  
Core Shell ◽  
Hydrophilic Surface ◽  
Iron Species ◽  
Au Nps ◽  
Shell Nanostructures ◽  
Iron Oxide Core

Encapsulation of iron oxide (Fe3O4) based nanoparticles (NPs) with Au NPs hold promising scope for catalysis, which overcomes the hindrance of the inherent hydrophilic surface of iron species and facilitates...

Core and dopant effects toward hydrogen gas sensing activity using Pd@N-CeO2 core–shell nanoflatforms

2021 ◽  
Vol 95 ◽  
pp. 325-332
Author(s):  
Dung Van Dao ◽  
Thuy T.D. Nguyen ◽  
Dong-Seog Kim ◽  
Ji-Wook Yoon ◽  
Yeon-Tae Yu ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Hydrogen Gas ◽  
Core Shell

Iron oxide-Palladium core-shell nanospheres for ferromagnetic resonance-based hydrogen gas sensing

2022 ◽  
Author(s):  
Shahbaz Khan ◽  
Nicholas B. Lawler ◽  
Abdulhakim Bake ◽  
Rezoan Rahman ◽  
David Cortie ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Ferromagnetic Resonance ◽  
Gas Sensing ◽  
Hydrogen Gas ◽  
Core Shell

Effect of Heterojunction Interface (SnO2\ZnO) on Gas Sensing Properties of Core-Shell Nanostructures

2020 ◽  
Vol MA2020-01 (28) ◽  
pp. 2052-2052 ◽  
Author(s):  
Priyanka Karnati ◽  
Sheikh Ali Akbar ◽  
Patricia Morris
Keyword(s):  
Gas Sensing ◽  
Core Shell ◽  
Sensing Properties ◽  
Shell Nanostructures ◽  
Gas Sensing Properties

Synthesis and Characterization of Hybrid ZnO@Ag Core-Shell Nanospheres for Gas Sensor Applications

2012 ◽  
Vol 710 ◽  
pp. 768-773 ◽  
Author(s):  
V. Ponnuvelu Dinesh ◽  
P. Biji ◽  
M. Kumaravel ◽  
A.K. Tyagi ◽  
M. Kamaruddin
Keyword(s):  
Surface Area ◽  
Gas Sensing ◽  
High Surface ◽  
High Surface Area ◽  
Silver Nanoclusters ◽  
Core Shell ◽  
Sensor Applications ◽  
Shell Nanostructures ◽  
Sensing Material ◽  
Interfacial Compatibility

ZnO nanospheres were prepared by hydrothermal method using CTAB as protecting ligands. The purified ZnO nanospheres were functionalized using 3-aminopropyl-trimethoxysilane (APTMS) and made into core-shell nanostructures with in-situ reduction of Ag+ into silver nanoclusters. ZnO nanospheres act as the core while silver nanoclusters act as shell material resulting in the formation of ZnO@Ag core-shell nanostructures. The precursor ZnO nanospheres and ZnO@Ag core-shell nanostructures were well characterised structurally by UV-Visible, FT-IR, XRD, and TGA and morphologically by SEM and HR-TEM. The analysis confirms that Ag nanoclusters are attached to ZnO nanospheres with uniform distribution. The induced surface area of these hybrid core-shell structures with isolated nanoclusters on ZnO surface pointed towards the possibility of having better sensitivity as an excellent gas sensing material. The present investigation provided an easy synthetic platform for obtaining high surface area core-shell nanostructures which enhances interfacial compatibility between metal oxide core and metal shell by suitable functionalization for generating better gas sensing materials.

scholarly journals A highly smart MEMS acetone gas sensors in array for diet-monitoring applications

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Jae Eun Lee ◽  
Chan Kyu Lim ◽  
Hyunjoon Song ◽  
Sung-Yool Choi ◽  
Dae-Sik Lee
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Sensor Arrays ◽  
Principal Component ◽  
Exhaled Breath ◽  
Gas Sensitivity ◽  
Au Nps ◽  
Mobile Healthcare ◽  
Monitoring Applications ◽  
Gas Sensing Properties

AbstractIn the present work, gas sensor arrays consisted of four different sensing materials based on CuO and their depositions on the MEMS microheaters were designed, fabricated and characterized. The sensor array is consisted with CuO, CuO with Pt NPs, ZnO–CuO and ZnO–CuO with Au NPs and their gas sensing properties are characterized for detection of exhaled breath-related VOCs. Through MEMS microheaters, power consumption is considered for application to healthcare devices which requires ultrasensitive acetone gas sensitivity. Also, using the principal component analysis, it enables to discriminate acetone gas, a biomarker for fat burning during diet, with other VOCs gases. The device would be applicable for on-site diet monitoring in the field of mobile healthcare.

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