PbSe quantum dots-based chemiresistors for room-temperature NO2 detection

SENSORS AND ACTUATORS B-CHEMICAL

卷:256

Article

Li, Min^1,2  Luo, Jingting¹  Fu, Chen¹  Kan, Hao³  Huang, Zhen³  Huang, Wangman³  Yang, Shuqin³  Zhang, Jianbing³  Tang, Jiang⁴  Fu, Yongqing⁵  Li, Honglang⁶  Liu, Huan³ 

[1] Shenzhen Univ, Coll Phys & Energy, Shenzhen Key Lab Adv Thin Films & Applicat, Shenzhen 518060, Peoples R China

[2] Shenzhen Univ, Coll Optoelect Engn, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov, Shenzhen 518060, Peoples R China

[3] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

[4] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

[5] Northumbria Univ, Fac Engn & Environm, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England

[6] Chinese Acad Sci, Inst Acoust, Beijing 100190, Peoples R China

关键词: Gas sensor;    Nitrogen oxide;    Lead selenide;    Quantum dots;    Cation exchange;   

DOI  :  10.1016/j.snb.2017.10.047

来源: Elsevier

【 摘 要 】

Colloidal quantum dots (CQDs) are promising building blocks for low-cost and high-performance gas sensors due to their excellent solution processability and extremely small size. Among chalcogenide CQDs, PbSe has a large exciton Bohr radius and exhibits strong confinement energies, facilitating the fast charge-carrier transport. However, CQDs-based devices are susceptible to degrade due to the poor stability of CQDs. Here, in order to obtain air-stable PbSe CQDs for gas sensing application, we synthesized PbSe CQDs using a cation exchange method with in situ chloride and cadmium passivation. The sharp absorption peak in UV-vis absorption spectra confirmed strong quantum confinement in the PbSe CQDs and their average diameter was estimated to be 2.87 +/- 0.23 nm. To construct gas sensors, PbSe CQDs were spin-coated onto ceramic substrates and then Pb(NO3)(2) treatment was carried out to remove the long-chain ligands surrounding PbSe CQDs. At 25 C, the sensor was highly sensitive and selective to NO2 with a response of 22.3 at 50 ppm and a fast response time of 7 s. Moreover, the sensor response showed a 85.2% stability as the time increased up to 20 days, suggesting the potential applications of PbSe CQDs for NO2 monitoring at room temperature. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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