Fabrication of silver nanoparticles decorated anodic aluminum oxide as the SERS substrate for the detection of pesticide thiram

Abstract

An efficient surface-enhanced Raman scattering (SERS) substrate is developed based on silver nanoparticles decorated anodic aluminum oxide (Ag/AAO). The AAO templates were fabricated using a two-step anodization approach, and silver nanoparticles (AgNPs) were obtained by thermal decomposition of Ag nitrate in AAO. The structure of Ag/AAO hybrid substrate is characterized by scanning electron microscopy (SEM). The results show that the as-prepared SERS substrates consist of high-density AgNPs with sizes of tens of nanometers. The AgNPs are adsorbed on the surface of AAO template in the form of network structure which is called “hot spot”. The SERS enhancement ability of the nanostructure is verified using thiram as probing molecules. The limit of detection is as low as 1×10⁻⁹ mol/L. The results indicate that the as-prepared substrate possesses excellent SERS sensitivity, high stability and uniformity enhancement.

Keywords

Silver Nanoparticles / Mass Percent / Anodic Aluminum Oxide / Anodic Aluminum Oxide Template / Thiram

References

[1] TanE Z, YinP G, YouT T, GuoH W, GuoL. ACS Applied Materials & Interfaces, 2012, 4: 3432

[2] TanE Z, YinP G, LiL D, GuoL. Chinese Optics Letters, 2011, 9: 082901

[3] TanE Z, YinP G, GuoL. Optoelectronics Letters, 2013, 9: 381

[4] QiJ X. Journal of Optoelectronics·Laser, 2014, 25: 282

[5] KoF H, TaiM R, LiuF K, ChangY C. Sensors & Actuators B Chemical, 2015, 211: 283

[6] ZhangZ L, ZhuW Y. Applied Surface Science, 2015, 333: 214

[7] YangT X, GuoX Y, WangH, FuS Y, YuJ, WenY, YangH F. Small, 2014, 10: 1325

[8] DammS, LordanF, MurphyA, McMillenM, PollardR, RiceJ H. Plasmonics, 2015, 9: 1371

[9] XuW, MengG W, HuangQ, HuX Y, HuangZ L, TangH B, ZhangJ X. Applied Surface Science, 2013, 271: 125

[10] ZhuY Q, LiM Q, YuD Y, YangL B. Talanta, 2014, 128: 117

[11] HanY B, LiuS J, LiuB H, JiangC L, ZhangZ P. RSC Advances, 2013, 6: 2776

This work has been supported by the Scientific Research Project of Beijing Educational Committee (No.KM201410017005), the BIPT Breeding Project of Outstanding Young Teachers and Management Backbone 2013, the Beijing University Academic Research Training Project (No.2014J00032), the Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions (No.CIT &TCD201304099), and BIPT-BPOAL-2013.