Optical Humidity Sensor Based on CdSe/ZnS Quantum Dots Modified by Porous Silica

Yuan, Baozhen; Zhang, Xuanyu; Yu, Jiahao; Zhou, Leiqing; Luo, Bingshen; Liu, Yanjun; Chen, Rui

2022-09-01

10.1002/admi.202201366

Advanced Materials Interfaces   影响因子和分区

2196-7350

Ultra-sensitive optical humidity sensors based on nanomaterials play important roles in the fields of science and industry. The related research has been reported, however, the underlying physical mechanism is still unclear. In order to clarify this point, and further improve the sensing performance, herein, optical humidity sensor based on porous silica/quantum dots (PS/QDs) hybrid nanoarchitecture has been developed. PS is selected to enhance emission of QDs due to its large surface roughness, which can improve light utilization. Under optimized conditions, the emission from the hybrid PS/QDs can be enhanced 6.5 times compared with the as-grown QDs. With the increase of relative humidity from 20% to 80%, the hybrid PS/QDs demonstrate excellent response, wide sensing range, fast response time (22-40 s), good selectivity, and repeatability. Based on laser spectroscopy, the sensing mechanism is ascribed to the passivation of the surface defects by water molecules, which results in enhanced emission. This work provides a simple and low-cost method to fabricate humidity sensors and shows promising applications in environmental detection.

CdSe ZnS quantum dots humidity sensing porous silica scattering surface defects

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[62174079] ; Science, Technology and Innovation Commission of Shenzhen Municipality["JCYJ20210324120204011","KQTD2015071710313656"] ; Special Funds for the Cultivation of Guangdong College Students' Scientific and Technological Innovation[pdjh2021c0019]

Chemistry ; Materials Science

Chemistry, Multidisciplinary ; Materials Science, Multidisciplinary

WOS:000850605800001

WILEY

20223712722404

Cadmium compounds ; Humidity sensors ; II-VI semiconductors ; Molecules ; Nanocrystals ; Semiconductor quantum dots ; Silica ; Surface roughness

Meteorological Instrumentation:443.2 ; Semiconducting Materials:712.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Nanotechnology:761 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Atomic and Molecular Physics:931.3 ; Crystalline Solids:933.1 ; Materials Science:951

Web of Science

Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

Yuan, Baozhen,Zhang, Xuanyu,Yu, Jiahao,et al. Optical Humidity Sensor Based on CdSe/ZnS Quantum Dots Modified by Porous Silica[J]. Advanced Materials Interfaces,2022.

Yuan, Baozhen.,Zhang, Xuanyu.,Yu, Jiahao.,Zhou, Leiqing.,Luo, Bingshen.,...&Chen, Rui.(2022).Optical Humidity Sensor Based on CdSe/ZnS Quantum Dots Modified by Porous Silica.Advanced Materials Interfaces.

Yuan, Baozhen,et al."Optical Humidity Sensor Based on CdSe/ZnS Quantum Dots Modified by Porous Silica".Advanced Materials Interfaces (2022).