MoS2‑ReS2 Heterojunctions
from a Bimetallic Co-chamber Feeding Atomic Layer Deposition for Ultrasensitive
MiRNA-21 Detection
Posted on 2020-06-17 - 16:06
Rhenium
disulfide (ReS2), which possessed a unique direct
band gap from the bulk to monolayer, played a very important role
in establishing optoelectronic devices, while the rapid recombination
of electron–hole pairs might hinder its further applications.
Therefore, to improve its photocurrent performance, a bimetallic co-chamber
feeding atomic layer deposition (ALD) with a precise dose regulation
strategy was used to fabricate MoS2-ReS2 heterojunctions
with a controllable Mo-to-Re ratio in this work. Furthermore, because
of the controlled addition of Mo atoms, the electron-transfer capacity,
carrier mobility, and photocurrent response of these heterojunctions
were significantly improved among which the sample obtained under
100 supercycles (one supercycle for this sample consists of the following
in turn: one ReCl5 pulse, one H2S pulse, one
ReCl5 pulse, one MoCl5 pulse, and one H2S pulse; the real Mo-to-Re ratio Rr = 57.9%) exhibited the best photocurrent response. Due to the significant
improvement in optoelectronic performance, a photoelectrochemical
(PEC) biosensor with the basis of the above optimized sample could
achieve the ultrasensitive detection of cancer-related miRNA-21 ranging
from 10 aM to 1 nM with a low detection limit of 2.8 aM.
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Liu, Lei; Ma, Kejian; Xu, Xiaoxuan; Shangguan, Changjian; Lv, Jun; Zhu, Songyang; et al. (2020). MoS2‑ReS2 Heterojunctions
from a Bimetallic Co-chamber Feeding Atomic Layer Deposition for Ultrasensitive
MiRNA-21 Detection. ACS Publications. Collection. https://doi.org/10.1021/acsami.0c07145
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AUTHORS (8)
LL
Lei Liu
KM
Kejian Ma
XX
Xiaoxuan Xu
CS
Changjian Shangguan
JL
Jun Lv
SZ
Songyang Zhu
SJ
Songlong Jiao
JW
Jianqiao Wang