Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, USA.
Nanoscale. 2014 Jul 21;6(14):7847-52. doi: 10.1039/c4nr01508h.
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 cm(2) 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.
晶体硅纳米管（Si NTs）提供了独特的优势，作为电和生化分析支架，通过其独特的形态和电可调性与固体纳米线或无定形/非导电纳米管相比。本报告研究了这种潜力。门控四探针电流-电压分析揭示了电学性质，如晶态和非晶态 Si NTs 之间的电阻率相差近 3 个数量级。晶体管传输特性的分析得到了 40.0 cm(2) V(-1) s(-1) 的场效应迁移率在晶态 Si NTs 中。中空形态还允许选择性的内外表面功能化和负载能力，无论是作为分子靶标载体还是作为生物分子分析的纳流道。我们首次展示了长达 22 μm 的 Si NTs 内吞荧光染料（罗丹明）和生物分子（BSA）的能力。
