Multifunctional Self-Doped Nanocrystal Thin-Film Transistor Sensors

Dongsun Choi, Mihyeon Park, Juyeon Jeong, Hang Beum Shin, Yun Chang Choi, Kwang Seob Jeong

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 (CO 2 gas, NO gas, and H 2 S 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 CO 2 gas and the NO gas molecules, and the mid-IR photodetection show reversible processes, whereas the chemisorption of l-cysteine biothiol and H 2 S 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 CO 2 gas molecule, sensing the CO 2 gas could be involved in the electronic-to-vibrational energy transfer. The target molecules are quantitatively analyzed, and the limits of detection for CO 2 and l-cysteine are 250 ppm and 10 nM, respectively, which are comparable to the performance of commercial detectors.

Original languageEnglish
Pages (from-to)7242-7249
Number of pages8
JournalACS Applied Materials and Interfaces
Volume11
Issue number7
DOIs
Publication statusPublished - 2019 Feb 20

Fingerprint

Thin film transistors
Nanocrystals
Gases
Carbon Monoxide
Sensors
Molecules
Semiconductor quantum dots
Cysteine
Physisorption
Chemisorption
Laser modes
Conduction bands
Energy transfer
Electron energy levels
Electrostatics
Quenching
Photoluminescence
Photons
Doping (additives)
Detectors

Keywords

  • gas sensor
  • mid-IR photodetector
  • probe-free biosensor
  • self-doped nanocrystal
  • TFT sensor

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Multifunctional Self-Doped Nanocrystal Thin-Film Transistor Sensors. / Choi, Dongsun; Park, Mihyeon; Jeong, Juyeon; Shin, Hang Beum; Choi, Yun Chang; Jeong, Kwang Seob.

In: ACS Applied Materials and Interfaces, Vol. 11, No. 7, 20.02.2019, p. 7242-7249.

Research output: Contribution to journalArticle

Choi, Dongsun ; Park, Mihyeon ; Jeong, Juyeon ; Shin, Hang Beum ; Choi, Yun Chang ; Jeong, Kwang Seob. / Multifunctional Self-Doped Nanocrystal Thin-Film Transistor Sensors. In: ACS Applied Materials and Interfaces. 2019 ; Vol. 11, No. 7. pp. 7242-7249.
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