Multifunctional Self-Doped Nanocrystal Thin-Film Transistor Sensors

Extra Form
author Kwang Seob Jeong
journal ACS Appl. Mater. Interfaces, 2019, 11 (7), pp 7242–7249
Homepage https://kwangsjeong.wixsite.com/ksjlab-koreauniv
?

단축키

Prev이전 문서

Next다음 문서

ESC닫기

+ - Up Down Comment Print

fe96825f97909b019d1818475c15fa44.jpg

Dongsun Choi(제1저자, 통합과정)



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.


am-2018-16083x_0005 TOC.jpeg



https://pubs.acs.org/doi/abs/10.1021/acsami.8b16083



Articles

1 2 3 4 5 6

Designed by sketchbooks.co.kr / sketchbook5 board skin

나눔글꼴 설치 안내


이 PC에는 나눔글꼴이 설치되어 있지 않습니다.

이 사이트를 나눔글꼴로 보기 위해서는
나눔글꼴을 설치해야 합니다.

설치 취소

Sketchbook5, 스케치북5

Sketchbook5, 스케치북5

Sketchbook5, 스케치북5

Sketchbook5, 스케치북5