International Iberian Nanotechnology Laboratory, Avenida Mestre Jose Veiga s/n, 4715-330 Braga, Portugal.
Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, United States.
J Colloid Interface Sci. 2014 Nov 1;433:34-42. doi: 10.1016/j.jcis.2014.07.020. Epub 2014 Jul 21.
Optical properties of gold nanorod (AuNR) particles self-assembled with DNA are systematically investigated. The particles assembly is driven by specific base-pair recognition between single strand (ss) DNA linker and DNA anchored to AuNRs, and it results in the distance- and morphology-dependent plasmonic coupling of AuNRs. The longitudinal plasmon band is distinctly affected by tuning the length of DNA linker, the temperature and linker/AuNRs ratio. We observed that the increase of temperature enhances the interparticle interactions and leads to clear distinguishable plasmonic signals between linker lengths up to 100 bases. Both absorbance decrease and shift of the longitudinal plasmon allow for use of AuNR for the DNA sensing applications.
系统研究了与 DNA 自组装的金纳米棒 (AuNR) 颗粒的光学性质。颗粒组装是由单链 (ss) DNA 接头与固定在 AuNR 上的 DNA 之间的特定碱基配对识别驱动的，这导致了 AuNR 之间的距离和形态依赖性等离子体耦合。通过调整 DNA 接头的长度、温度和接头/AuNR 比，可以明显影响纵向等离子体带。我们观察到，温度的升高增强了颗粒间的相互作用，导致在长达 100 个碱基的接头长度之间产生明显可区分的等离子体信号。吸收减少和纵向等离子体的位移都允许使用 AuNR 进行 DNA 传感应用。
