Selective Functionalization and Loading of Biomolecules in Crystalline Silicon Nanotube Field-Effect Transistors
- Authors
- Kwon,Soonshin; Chen, Zack C. Y.; Noh, Hyunwoo; Lee, Ju Hun; Liu, Hang; Cha, Jennifer N.; Xiang, Jie
- Issue Date
- Jul-2014
- Publisher
- Royal Society of Chemistry
- Citation
- Nanoscale, v.6, no.14, pp.7847 - 7852
- Indexed
- SCIE
SCOPUS
- Journal Title
- Nanoscale
- Volume
- 6
- Number
- 14
- Start Page
- 7847
- End Page
- 7852
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/22358
- DOI
- 10.1039/c4nr01508h
- ISSN
- 2040-3364
- Abstract
- Crystalline silicon nanotubes (Si NTs) provide distinctive advantages as electrical and biochemical analysis scaffolds through their unique morphology and electrical tunability compared to solid nanowires or amorphous/non-conductive nanotubes. Such potential is investigated in this report. Gate-dependent four-probe current–voltage analysis reveals electrical properties such as resistivity to differ by nearly 3 orders of magnitude between crystalline and amorphous Si NTs. Analysis of transistor transfer characteristics yields a field effect mobility of 40.0 cm2 V−1 s−1 in crystalline Si NTs. The hollow morphology also allows selective inner/outer surface functionalization and loading capability either as a carrier for molecular targets or as a nanofluidic channel for biomolecular assays. We present for the first time a demonstration of internalization of fluorescent dyes (rhodamine) and biomolecules (BSA) in Si NTs as long as 22 μm in length.
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