100 nm scale low-noise sensors based on aligned carbon nanotube networks: overcoming the fundamental limitation of network-based sensors
- 100 nm scale low-noise sensors based on aligned carbon nanotube networks: overcoming the fundamental limitation of network-based sensors
- 이민백; 이주형; 김태현; 이형우; 이병양; 박준; 전영민; 성맹제; 홍승훈
- Electronics and devices; Instrumentation and measurement; Nanoscale science and low-D systems
- Issue Date
- VOL 21, NO 5, 055504-1-055504-8
- Nanoscale sensors based on single-walled carbon nanotube (SWNT) networks have been
considered impractical due to several fundamental limitations such as a poor sensitivity and
small signal-to-noise ratio. Herein, we present a strategy to overcome these fundamental
problems and build highly-sensitive low-noise nanoscale sensors simply by controlling the
structure of the SWNT networks. In this strategy, we prepared nanoscale width channels based
on aligned SWNT networks using a directed assembly strategy. Significantly, the aligned
network-based sensors with narrower channels exhibited even better signal-to-noise ratio than
those with wider channels, which is opposite to conventional random network-based sensors.
As a proof of concept, we demonstrated 100 nm scale low-noise sensors to detect mercury ions
with the detection limit of ∼1 pM, which is superior to any state-of-the-art portable detection
system and is below the allowable limit of mercury ions in drinking water set by most
government environmental protection agencies. This is the first demonstration of 100 nm scale
low-noise sensors based on SWNT networks. Considering the increased interests in
high-density sensor arrays for healthcare and environmental protection, our strategy should
have a significant impact on various industrial applications.
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