Multifunctional Self-Doped Nanocrystal Thin-Film Transistor Sensors
- Authors
- Choi, Dongsun; Park, Mihyeon; Jeong, Juyeon; Shin, Hang-Beum; Choi, Yun Chang; Jeong, Kwang Seob
- Issue Date
- 20-2월-2019
- Publisher
- AMER CHEMICAL SOC
- Keywords
- self-doped nanocrystal; gas sensor; probe-free biosensor; mid-IR photodetector; TFT sensor
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.11, no.7, pp.7242 - 7249
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 11
- Number
- 7
- Start Page
- 7242
- End Page
- 7249
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/67603
- DOI
- 10.1021/acsami.8b16083
- ISSN
- 1944-8244
- Abstract
- Self-doping in nanocrystals allows accessing higher quantum states. The electrons occupying the lowest energy state of the conduction band form a metastable state that is very sensitive to the electrostatic potential of the surface. Here, we demonstrate that the high charge sensitivity of the self-doped HgSe colloidal quantum dot solid can be used for sensing three different targets with different phases through self-doped HgSe nanocrystal/ZnO thin-film transistors: the environmental gases (CO2 gas, NO gas, and H2S gas); mid-IR photon; and biothiol (L-cysteine) molecules. The self-doped quantum dot solid detects the targets through different mechanisms. The physisorption of the CO2 gas and the NO gas molecules, and the mid-IR photodetection show reversible processes, whereas the chemisorption of L-cysteine biothiol and H2S gas molecules shows irreversible processes. Considering the quenching of mid-IR intraband photoluminescence of the HgSe colloidal quantum dot solid by the vibrational mode of the CO2 gas molecule, sensing the CO2 gas could be involved in the electronic-to-vibrational energy transfer. The target molecules are quantitatively analyzed, and the limits of detection for CO2 and L-cysteine are 250 ppm and 10 nM, respectively, which are comparable to the performance of commercial detectors.
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