New approach towards imaging �?-DNA using scanning tunneling microscopy/spectroscopy (STM/STS)

[摘要] A new methodology to anchor ðœ�?-DNA to silanized ð‘�??-Si(111) surface using Langmuir Blodget trough was developed. The ð‘�??-Si (111) was silanized by treating it with low molecular weight octyltrichlorosilane in toluene. Scanning tunneling microscopy (STM) image of ðœ�?-DNA on octyltrichlorosilane deposited Si substrate shows areas exhibiting arrayed structures of 700 nm length and 40 nm spacing. Scanning tunneling spectroscopy (STS) at different stages depict a broad distribution of defect states in the bandgap region of ð‘�??-Si(111) which presumably facilitates tunneling through otherwise insulating DNA layer.

[学科分类] 材料工程

[关键词] DNA;scanning tunneling microscopy;Langmuir Blodget technique;silanization.