scholarly journals Green Synthesis of SnO2/Carbon Quantum Dots Nanocomposite for Gas Sensing Application

2021 ◽  
Vol 8 (7) ◽  
pp. 332-336
Author(s):  
Hare Narayan Prajapati ◽  
Pradeep Kumar Khiriya ◽  
Gagan Kant Tripathi
Keyword(s):  
Quantum Dots ◽  
Green Synthesis ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Sno2 Nanoparticles ◽  
Carbon Quantum Dots ◽  
Optimum Operating ◽  
Grape Fruit ◽  
Different Temperatures ◽  
Grape Fruit Juice

SnO2/Carbon Quantum Dots (CQDs) were synthesized by a hydrothermal method using grape fruit juice. The nanocomposites (NC) were characterized by means of XRD and Gas sensing properties. The sensor devices were fabricated using SnO2/CQDs NC as sensing materials. The effect of the CQDs content on the gas-sensing responses and the gas-sensing selectivity was investigated. In this work, the gas sensor developed is exposed to carbon monoxide polluting gas like at different temperatures to determine the optimum operating temperatures which allow obtaining the highest sensitivity for gas. Keywords: Green synthesis, Grape fruit, SnO2 nanoparticles, CQDs, Gas sensor.

A sustainable green synthesis of functionalized biocompatible carbon quantum dots from Aloe barbadensis miller and its multifunctional applications

2021 ◽  
pp. 111414
Author(s):  
Jalaja Prasad Malavika ◽  
Chellappan Shobana ◽  
Murugesan Ragupathi ◽  
Ponnuchamy Kumar ◽  
Yun Sung Lee ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Green Synthesis ◽  
Carbon Quantum Dots ◽  
Aloe Barbadensis

Green synthesis of fluorescent carbon quantum dots for the detection of mercury(ii) and glutathione

2018 ◽  
Vol 42 (8) ◽  
pp. 5814-5821 ◽  
Author(s):  
Daraksha Bano ◽  
Vijay Kumar ◽  
Vikas Kumar Singh ◽  
Syed Hadi Hasan
Keyword(s):  
Quantum Dots ◽  
Green Synthesis ◽  
Carbon Quantum Dots ◽  
First Time ◽  
Fluorescent Carbon

On–off–on detection of Hg2+ and GSH using green-synthesized CQDs from T. indica leaves for the first time.

UV-enhanced NO2 sensor using ZnO quantum dots sensitized SnO2 porous nanowires

2022 ◽  
Author(s):  
Tianchen Jiang ◽  
xin liu ◽  
jianbo sun
Keyword(s):  
Quantum Dots ◽  
Gas Sensor ◽  
Uv Irradiation ◽  
Gas Sensing ◽  
Complex Impedance ◽  
Sensing Properties ◽  
Sensing Mechanism ◽  
No2 Sensor ◽  
Zno Quantum Dots ◽  
Uv Excitation

Abstract ZnO quantum dots sensitized SnO2 porous nanowires were fabricated and designed for UV excitation gas sensor. The ZnO/SnO2 composite (SZQ1%) with the molar proportion of 1:100 exhibits excellent sensing properties to NO2 gas under UV irradiation at 40oC. The humidity stability of SZQ1% was also measured and discussed by DC reversed circuit and complex impedance curves. The gas sensing mechanism is well discussed and illustrated to the ZnO quantum dots sensitized and the increased photo-generated carriers under UV irradiation.

scholarly journals Enhanced Methane Sensing Properties of WO3 Nanosheets with Dominant Exposed (200) Facet via Loading of SnO2 Nanoparticles

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 351 ◽  
Author(s):  
Dongping Xue ◽  
Junjun Wang ◽  
Yan Wang ◽  
Guang Sun ◽  
Jianliang Cao ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Defect Density ◽  
Sno2 Nanoparticles ◽  
High Reactivity ◽  
Optimum Operating ◽  
Optimum Operating Temperature ◽  
Sensing Properties ◽  
Long Term Stability ◽  
Subsequent Calcination

Methane detection is extremely difficult, especially at low temperatures, due to its high chemical stability. Here, WO3 nanosheets loaded with SnO2 nanoparticles with a particle size of about 2 nm were prepared by simple impregnation and subsequent calcination using SnO2 and WO3·H2O as precursors. The response of SnO2-loaded WO3 nanosheet composites to methane is about 1.4 times higher than that of pure WO3 at the low optimum operating temperature (90 °C). Satisfying repeatability and long-term stability are ensured. The dominant exposed (200) crystal plane of WO3 nanosheets has a good balance between easy oxygen chemisorption and high reactivity at the dangling bonds of W atoms, beneficial for gas-sensing properties. Moreover, the formation of a n–n type heterojunction at the SnO2-WO3 interface and additionally the increase of specific surface area and defect density via SnO2 loading enhance the response further. Therefore, the SnO2-WO3 composite is promising for the development of sensor devices to methane.

Green Synthesis of Fluorescent Carbon Quantum Dots for Detection of Hg2+

2014 ◽  
Vol 42 (9) ◽  
pp. 1252-1258 ◽  
Author(s):  
Yue XU ◽  
Chun-Jing TANG ◽  
Hong HUANG ◽  
Chao-Qun SUN ◽  
Ya-Kun ZHANG ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Green Synthesis ◽  
Carbon Quantum Dots ◽  
Fluorescent Carbon
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