Sarangi S N, Goswami K, Sahu S N
Institute of Physics, Sachivalaya Marg, Bhubaneswar 751005, India.
Biosens Bioelectron. 2007 Jun 15;22(12):3086-91. doi: 10.1016/j.bios.2007.01.002. Epub 2007 Jan 16.
DNA template driven CdSe nanobeads (NBs) and nanowires (NWs) have been synthesized by an electrodeposition technique. The synthesis protocol has yielded randomly oriented cubic CdSe NBs with mean size approximately 3.0 nm in presence of single stranded DNA, poly G(30). Monocrystalline cubic CdSe NWs of width approximately 4.0 nm with string-like morphology have been achieved when synthesized in presence of both poly G(30) and its conjugate, poly C(30). Optical absorption of CdSe NBs show a blue shift of 0.8 eV and long wavelength tailing where as NWs show steep increase of absorption in shorter wavelength regime accompanied by a further blue shift. DNA tags to the NBs or NWs have been confirmed from Fourier transform infrared spectroscopy measurements. Biomolecular recognition with CdSe NWs have been established by photoluminescence measurements.
通过电沉积技术合成了DNA模板驱动的CdSe纳米珠（NBs）和纳米线（NWs）。在单链DNA、聚G（30）存在的情况下，合成方案产生了平均尺寸约为3.0 nm的随机取向立方CdSe纳米珠。当在聚G（30）及其共轭物聚C（30）两者存在的情况下合成时，获得了宽度约为4.0 nm、具有线状形态的单晶立方CdSe纳米线。CdSe纳米珠的光吸收显示出0.8 eV的蓝移和长波长拖尾，而纳米线在较短波长范围内显示出吸收的急剧增加，并伴有进一步的蓝移。通过傅里叶变换红外光谱测量证实了纳米珠或纳米线上的DNA标签。通过光致发光测量建立了CdSe纳米线的生物分子识别。
