Electromagnetic and Chemical Enhancements of Surface-Enhanced Raman Scattering Spectra from Cu2O Hexagonal Nanoplates

Liu, Chang1,2; Song, Qichen2; Chen, Jianan1; Li, Xinhao2; Cai, Jingxuan1; Lu, Zhouguang3; Li, Wendi1; Fang, Nicholas X.2; Feng, Shien-Ping1

2019-07-03

10.1002/admi.201900534

Advanced Materials Interfaces   影响因子和分区

2196-7350

Surface-enhanced Raman scattering (SERS) has been extensively studied, but quantifiable results on electromagnetic enhancement (EM) are primarily focused on noble metals; as for metal oxides, limited studies exist, and a common impression regarding Raman scatterings is not able to elaborate mechanisms involving EM and multiplicative chemical enhancements. Leveraging on the shape-controlled synthesis of Cu2O, the hexagonal nanoplates exhibit a remarkable SERS activity and reproducible measurements, enabling a systematic investigation of the SERS mechanism of Cu2O. Here the shape-dependent SERS activity is elaborated by applying finite-difference time-domain simulation; the dominant contributions to SERS activity ascribed to chemical-bonding and charge-transfer (CT) enhancements are investigated using ab initio calculation. As the example, it is shown that the chemisorption of 4-aminothiophenol (PATP) on Cu2O nanoplates leads to the shift of highest occupied molecular orbital and lowest unoccupied molecular orbital levels, promoting efficient CT processes. The vibronic coupling of the conduction and valence bands of Cu2O with the molecular orbital of PATP further enhances the Raman scattering. This study on the combined EM and CT channels on Cu2O nanoplates is promising to identify a new group of SERS-active substrates and advance the fundamental understanding of SERS mechanism, which also opens up a prospect of biocompatible and in situ diagnosis.

chemical enhancement Cu2O nanoplates electromagnetic enhancement shape-controlled synthesis surface-enhanced Raman scattering

SCI ; EI

英语

其他

General Research Fund of the Research Grants Council of Hong Kong Special Administrative Region, China[17206518]

Chemistry ; Materials Science

Chemistry, Multidisciplinary ; Materials Science, Multidisciplinary

WOS:000476214000001

WILEY

20192807165316

Biocompatibility ; Calculations ; Charge transfer ; Chemical bonds ; Copper oxides ; Finite difference time domain method ; Molecular orbitals ; Nanostructures ; Raman scattering ; Substrates ; Time domain analysis

Immunology:461.9.1 ; Light/Optics:741.1 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Inorganic Compounds:804.2 ; Mathematics:921 ; Classical Physics; Quantum Theory; Relativity:931 ; Solid State Physics:933

Web of Science

1.Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong 999077, Peoples R China
2.MIT, Dept Mech Engn, Cambridge, MA 02139 USA
3.South Univ Sci & Technol China, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Liu, Chang,Song, Qichen,Chen, Jianan,et al. Electromagnetic and Chemical Enhancements of Surface-Enhanced Raman Scattering Spectra from Cu2O Hexagonal Nanoplates[J]. Advanced Materials Interfaces,2019,6(17).

Liu, Chang.,Song, Qichen.,Chen, Jianan.,Li, Xinhao.,Cai, Jingxuan.,...&Feng, Shien-Ping.(2019).Electromagnetic and Chemical Enhancements of Surface-Enhanced Raman Scattering Spectra from Cu2O Hexagonal Nanoplates.Advanced Materials Interfaces,6(17).

Liu, Chang,et al."Electromagnetic and Chemical Enhancements of Surface-Enhanced Raman Scattering Spectra from Cu2O Hexagonal Nanoplates".Advanced Materials Interfaces 6.17(2019).