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

Bulletin of materials science

Suguna D Adyanthaya¹  Sushama Pethkar¹  Murali Sastry²  C V Dharmadhikari³  Shirshendu Dey³ 

[1]Nanoscience Group, Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, India$$Nanoscience Group, Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, IndiaNanoscience Group, Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, India$$

[2]Tata Chemicals Limited, Leela Business Park, Andheri-Kurla Road, Andheri (E), Mumbai 400 059, India$$Tata Chemicals Limited, Leela Business Park, Andheri-Kurla Road, Andheri (E), Mumbai 400 059, IndiaTata Chemicals Limited, Leela Business Park, Andheri-Kurla Road, Andheri (E), Mumbai 400 059, India$$

[3]DST Unit of Nanoscience and Centre of Advanced Studies in Materials Science and Solid State Physics, Department of Physics, University of Pune, Pune 411 007, India$$DST Unit of Nanoscience and Centre of Advanced Studies in Materials Science and Solid State Physics, Department of Physics, University of Pune, Pune 411 007, IndiaDST Unit of Nanoscience and Centre of Advanced Studies in Materials Science and Solid State Physics, Department of Physics, University of Pune, Pune 411 007, India$$

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

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

A new methodology to anchor �?-DNA to silanized �??-Si(111) surface using Langmuir Blodget trough was developed. The �??-Si (111) was silanized by treating it with low molecular weight octyltrichlorosilane in toluene. Scanning tunneling microscopy (STM) image of �?-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 �??-Si(111) which presumably facilitates tunneling through otherwise insulating DNA layer.

【 授权许可】

Unknown