Lee, Minbaek Lee, Joohyung Kim, Tae Hyun Lee, Hyungwoo Lee, Byung Yang Park, June Jhon, Young Min Seong, Maeng-Je Hong, Seunghun 2024-01-20T20:00:49Z 2024-01-20T20:00:49Z 2021-09-02 2010-02-05 0957-4484 https://pubs.kist.re.kr/handle/201004/131722 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 similar to 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. English IOP PUBLISHING LTD EPSILON-EXPANSION 1/F NOISE DEVICES CONDUCTIVITY IONS 100 nm scale low-noise sensors based on aligned carbon nanotube networks: overcoming the fundamental limitation of network-based sensors Article 10.1088/0957-4484/21/5/055504 1 NANOTECHNOLOGY, v.21, no.5 NANOTECHNOLOGY 21 5 scie scopus 000273348400016 2-s2.0-73949140005 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Science & Technology - Other Topics Materials Science Physics Article EPSILON-EXPANSION 1/F NOISE DEVICES CONDUCTIVITY IONS Electronics and devices Instrumentation and measurement Nanoscale science and low-D systems