Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios.
Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios.
复制标题
大纵横比金纳米棒的等离子体传感特性
DOI:
10.3390/s18103458
复制
发表时间:
2018-10-15
期刊:
影响因子:
--
通讯作者:
Deng S
中科院分区:
文献类型:
--
作者:
Zhuang C;Xu Y;Xu N;Wen J;Chen H;Deng S
Plasmonic gold nanorods play important roles in nowadays state-of-the-art plasmonic sensing techniques. Most of the previous studies and applications focused on gold nanorods with relatively small aspect ratios, where the plasmon wavelengths are smaller than 900 nm. Gold nanorods with large aspect ratios are predicted to exhibit high refractive-index sensitivity (Langmir 2008, 24, 5233–5237), which therefore should be promising for the development of high-performance plasmonic chemical- and bio-sensors. In this study, we developed gold nanorods with aspect ratios over 7.9, which exhibit plasmon resonances around 1064 nm. The refractive index (RI) sensitivity of these nanorods have been evaluated by varying their dielectric environment, whereby a sensitivity as high as 473 nm/RIU (refractive index unit) can be obtained. Furthermore, we have demonstrated the large-aspect-ratio nanorods as efficient substrate for surface enhanced Raman spectroscopy (SERS), where an enhancement factor (EF) as high as 9.47 × 108 was measured using 4-methylbenzenethiol (4-MBT) as probe molecule. Finally, a type of flexible SERS substrate is developed by conjugating the gold nanorods with the polystyrene (PS) polymer. The results obtained in our study can benefit the development of plasmonic sensing techniques utilized in the near-infrared spectral region.
登录
查看更多内容
影响因子:
17.1
作者:
Xu, Zai-Quan;Zhang, Yupeng;Bao, Qiaoliang
通讯作者:
Bao, Qiaoliang
影响因子:
3.7
作者:
Nobrega, Marcelo M.;Souza, Klester S.;Temperini, Marcia L. A.
通讯作者:
Temperini, Marcia L. A.
影响因子:
3.3
作者:
Orendorff, CJ;Gearheart, L;Murphy, CJ
通讯作者:
Murphy, CJ
影响因子:
7.4
作者:
Orendorff, CJ;Gole, A;Murphy, CJ
通讯作者:
Murphy, CJ
影响因子:
2.5
作者:
Khan, Muhammad A.;Hogan, Timothy P.;Shanker, B.
通讯作者:
Shanker, B.