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 language | English |
|---|---|
| Pages (from-to) | 7242-7249 |
| Number of pages | 8 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 11 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 2019 Feb 20 |
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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 journal › Article
}
TY - JOUR
T1 - Multifunctional Self-Doped Nanocrystal Thin-Film Transistor Sensors
AU - Choi, Dongsun
AU - Park, Mihyeon
AU - Jeong, Juyeon
AU - Shin, Hang Beum
AU - Choi, Yun Chang
AU - Jeong, Kwang Seob
PY - 2019/2/20
Y1 - 2019/2/20
N2 - 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.
AB - 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.
KW - gas sensor
KW - mid-IR photodetector
KW - probe-free biosensor
KW - self-doped nanocrystal
KW - TFT sensor
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UR - http://www.scopus.com/inward/citedby.url?scp=85061957714&partnerID=8YFLogxK
U2 - 10.1021/acsami.8b16083
DO - 10.1021/acsami.8b16083
M3 - Article
VL - 11
SP - 7242
EP - 7249
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 7
ER -