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Synthesis and characterization of peptide nucleic acid-platinum nanoclusters

机译:肽核酸-铂纳米簇的合成与表征

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摘要

Peptide nucleic acid (PNA) is an analogue of deoxyribonucleic acid (DNA) and possesses a neutral backbone that affords stronger hybridization, greater stability and higher specificity in base pairing. However, it has not been explored as much as DNA in self-assembling functional nanostructur.es or nanoelectronic devices. We report here for the first time the metallization of PNA with platinum (Pt) nanoparticles via chemical binding, reduction and deposition. Pt ions from a precursor salt solution are allowed to bind over the PNA fragments followed by a reduction and then growth into metal nanoparticles. PNA-Pt complexes form chains several hundred nanometres in length and by varying the duration of chemical reduction step, the dimension of the Pt nanoparticles can be controlled. The structural features and chemical composition of PNA-Pt nanoparticles have been characterized via scanning electron microscopy, transmission electron microscopy and Fourier transform-infrared spectroscopy. These results are also supported by modelling and analysis of the nature of high-lying molecular orbitals on PNA using density functional theory (DFT) method.
机译:肽核酸(PNA)是脱氧核糖核酸(DNA)的类似物,具有中性骨架,可提供更强的杂交,更大的稳定性和更高的碱基配对特异性。然而,在自组装功能纳米结构或纳米电子器件中,DNA的研究还不多。我们在此首次报告通过化学键合,还原和沉积法将PNA与铂(Pt)纳米粒子金属化。使来自前体盐溶液的Pt离子结合在PNA片段上,然后还原,然后生长为金属纳米颗粒。 PNA-Pt络合物形成长度为数百纳米的链,并且通过改变化学还原步骤的持续时间,可以控制Pt纳米粒子的尺寸。 PNA-Pt纳米粒子的结构特征和化学组成已通过扫描电子显微镜,透射电子显微镜和傅立叶变换红外光谱进行了表征。通过使用密度泛函理论(DFT)方法对PNA上的高分子轨道的性质进行建模和分析,也支持了这些结果。

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