TY - JOUR
T1 - Understanding Carbon Nanotube-Based Ionic Diodes
T2 - Design and Mechanism
AU - Peng, Ran
AU - Pan, Yueyue
AU - Liu, Biwu
AU - Li, Zhi
AU - Pan, Peng
AU - Zhang, Shuailong
AU - Qin, Zhen
AU - Wheeler, Aaron R.
AU - Tang, Xiaowu
AU - Liu, Xinyu
N1 - Publisher Copyright:
© 2021 Wiley-VCH GmbH
PY - 2021/8/5
Y1 - 2021/8/5
N2 - The rectification of ion transport through biological ion channels has attracted much attention and inspired the thriving invention and applications of ionic diodes. However, the development of high-performance ionic diodes is still challenging, and the working mechanisms of ionic diodes constructed by 1D ionic nanochannels have not been fully understood. This work reports the systematic investigation of the design and mechanism of a new type of ionic diode constructed from horizontally aligned multi-walled carbon nanotubes (MWCNTs) with oppositely charged polyelectrolytes decorated at their two entrances. The major design and working parameters of the MWCNT-based ionic diode, including the ion channel size, the driven voltage, the properties of working fluids, and the quantity and length of charge modification, are extensively investigated through numerical simulations and/or experiments. An optimized ionic current rectification (ICR) ratio of 1481.5 is experimentally achieved on the MWCNT-based ionic diode. These results promise potential applications of the MWCNT-based ionic diode in biosensing and biocomputing. As a proof-of-concept, DNA detection and HIV-1 diagnosis is demonstrated on the ionic diode. This work provides a comprehensive understanding of the working principle of the MWCNT-based ionic diodes and will allow rational device design and optimization.
AB - The rectification of ion transport through biological ion channels has attracted much attention and inspired the thriving invention and applications of ionic diodes. However, the development of high-performance ionic diodes is still challenging, and the working mechanisms of ionic diodes constructed by 1D ionic nanochannels have not been fully understood. This work reports the systematic investigation of the design and mechanism of a new type of ionic diode constructed from horizontally aligned multi-walled carbon nanotubes (MWCNTs) with oppositely charged polyelectrolytes decorated at their two entrances. The major design and working parameters of the MWCNT-based ionic diode, including the ion channel size, the driven voltage, the properties of working fluids, and the quantity and length of charge modification, are extensively investigated through numerical simulations and/or experiments. An optimized ionic current rectification (ICR) ratio of 1481.5 is experimentally achieved on the MWCNT-based ionic diode. These results promise potential applications of the MWCNT-based ionic diode in biosensing and biocomputing. As a proof-of-concept, DNA detection and HIV-1 diagnosis is demonstrated on the ionic diode. This work provides a comprehensive understanding of the working principle of the MWCNT-based ionic diodes and will allow rational device design and optimization.
KW - carbon nanotube (CNT)
KW - ionic current rectification
KW - ionic diode
KW - ionotronics
KW - nanofluidics
UR - http://www.scopus.com/inward/record.url?scp=85108844874&partnerID=8YFLogxK
U2 - 10.1002/smll.202100383
DO - 10.1002/smll.202100383
M3 - Article
C2 - 34171160
AN - SCOPUS:85108844874
SN - 1613-6810
VL - 17
JO - Small
JF - Small
IS - 31
M1 - 2100383
ER -
