Ultrabroad spectral response and excellent SERS performance of PbS-assisted Au/PbS/Au nanostars. Issue 47 (22nd November 2022)

• Record Type: Journal Article
• Authors: Feng, Jing-Ru; Zhao, Zhi-Rui; Xiong, Zhong-Long; Kang, Hao-Sen; Ding, Si-Jing; Ma, Liang; Zhou, Li
• Is Part Of: Nanoscale. Volume 14:Issue 47(2022)
• Page Start: 17633
• Page End: 17640
• Publication Date: 2022-11-22
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr04666k
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : We successfully prepared Au/PbS/Au nanostars with adjustable spine length. The SERS results show that the Au/PbS/Au nanostars (long) have the strongest Raman signal. Abstract : Noble metal nanomaterials have many excellent optical properties due to localized surface plasmon resonance induced by external electric and magnetic fields. The plasmon-enhanced optical properties of nanomaterials can be controlled by changing their shapes or compositions. Here, we use a gentle approach to synthesize Au/PbS/Au nanostars with multiple tips and explore the surface-enhanced Raman scattering (SERS) activity, the second harmonic generation (SHG), and photocatalytic performance. The Au/PbS/Au nanostars have ultrabroad spectral responses and significantly enhanced local electric fields near the sharp tips. The size and tip length of the Au/PbS/Au nanostars can be adjusted by changing the amount of HAuCl4 . The Au/PbS/Au nanostars exhibit largely enhanced SERS activity and photocatalytic degradation efficiency compared with the Au bipyramids and the Au BPs@PbS nanocrystals. In addition, the SHG of Au/PbS/Au nanostars is also significantly enhanced due to asymmetry and local field enhancement. This research shows potential in many applications ranging from photophysics to photochemistry.