期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 116, 期 26, 页码 13917-13927出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp300902u
关键词
-
资金
- DARPA/US Army through EngeniusMicro [W31P4Q10C0027]
- NSF-STC [DMR-0120967]
- National Defense Science and Engineering Graduate (NDSEG) [32 CFR 168a]
- [NSF-CBET 0930781]
- [DMR 0922776]
We report on the facile fabrication of efficient porous alumina membrane-based SERS substrates that avoid the cumbersome stages of chemical surface modification of the pores and premixing/infiltration of nanoparticles with analytes. The design relies on higher light transmission through the SERS substrates by widening the cylindrical pore diameter to 355 nm and in situ growth of uniform silver nanoparticles on the inner walls. Electromagnetic simulations confirm that the interaction of excitation light with the nanoparticles along the pore walls can be maximized in such a membrane when the nanoparticles are placed within the first 14 mu m of the pore depth. For common benchmark Raman analytes such as benzenethiol and Rhodamine 6G, nanomolar detection limits are readily obtained without any additional chemical surface functionalization and/or additional premixing and preconcentration of metal nanoparticles and analytes. Moreover, a high enhancement of 10(6) and a micromolar detection limit are achieved for nonresonant, Raman-stealthy perchloric acid molecules. Quantum mechanical calculations of perchloric acid bound to nanostructured silver clusters with different sizes and binding sites suggest that the maximum chemical enhancement is achieved for molecules located at the tips of the (111) planes of silver lattices, which are abundantly available on the nanoparticles grown in this study.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据