Comparative Study on Polarization of DNA and CdSe Quantum Dots  

作　　者：周星飞 崔成毅 张金海 刘建华 刘京松 

机构地区：[1]Department of Physics, Ningbo University, Ningbo 315211

出　　处：《Chinese Physics Letters》2010年第3期336-338,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation under Grant No 10604034, the Natural Science Foundation of Zhejiang Province （Y606309）, Ningbo Natural Science Foundation （2006A610046）, and K. C. Wong Magna Fund in Ningbo University.

摘　　要：The polarizabilities of DNA in transverse direction and CdSe semiconductor quantum dots （QDs） deposited on mica surface are compared by means of electrostatic force microscopy （EFM）. We observe clear EFM-phase shift over CdSe QDs, while no obvious signal on DNA is detected, suggesting that DNA molecules is an electrical insulator.The polarizabilities of DNA in transverse direction and CdSe semiconductor quantum dots （QDs） deposited on mica surface are compared by means of electrostatic force microscopy （EFM）. We observe clear EFM-phase shift over CdSe QDs, while no obvious signal on DNA is detected, suggesting that DNA molecules is an electrical insulator.

关 键 词：Instrumentation and measurement Surfaces interfaces and thin films Medical physics Biological physics Nanoscale science and low-D systems 

分 类 号：Q523[生物学—生物化学] TB383[一般工业技术—材料科学与工程]