Gold nanostars(Au NSs)are asymmetric anisotropic nanomaterials with sharp edge structure.As a promising branched nanomaterial,Au NS has excellent plasmonic absorption and scattering properties.In order to tune the pla...Gold nanostars(Au NSs)are asymmetric anisotropic nanomaterials with sharp edge structure.As a promising branched nanomaterial,Au NS has excellent plasmonic absorption and scattering properties.In order to tune the plasmonic photothermal and surface-enhanced Raman scattering(SERS)activity of Au NSs to obtain the desired characteristics,the ffects of reagents on the local surface plasmon resonance(LSPR)bands of Au NSs were studied and the morphology and size were regulated.Nanoparticles with different sharp edges were synthesized to make their local plasmon resonance mode tunable in the visible and near-infrared region.The effects of the number and sharpness of different tips under the control of AgNO3 on the photothermal response of Au NSs and the SERS ac-tivity and their mechanism were discussed in detail.The results show that as the length of the branch tip becomes longer and the sharpness increases,the plasmonic photothermal effect of Au NSs is strengthened,and the photother-mal conversion efficiency is the highest up to 40%when the length of Au NSs is the longest.Au NSs with high SERS activity are used for the Raman detection substrate.Based on this property,the quantitative detection of the pesticide thiram is achieved.展开更多
Surface‐enhanced Raman scattering(SERS)spectroscopy has renowned its fame for the ultra‐high sensitivity and single‐molecule detection ability,and listed as a fingerprint spectrum representative in various trace de...Surface‐enhanced Raman scattering(SERS)spectroscopy has renowned its fame for the ultra‐high sensitivity and single‐molecule detection ability,and listed as a fingerprint spectrum representative in various trace detection fields.Considerable efforts have been made by researchers to design high‐sensitive SERS‐active substrates ranging from noble metals to semiconductors.This review summarizes the fundamental theories for SERS technique,that is,the electromagnetic enhancement mechanism and chemical enhancement mechanism and the state‐of‐the‐art design strategies for noble metal and semiconductor substrates.It also sheds light on the effective approaches to improve the SERS activity for noble metal substrates,that is,tuning the localized surface plasmon resonance position,the assembling of hot spots,and precise controlling of nanogaps.Although charge transfer is considered as the main reason for the enhancement mechanism for semiconductors at the present stage,the underlying theoretical basis remains mysterious.This review summarized the critical points for SERS‐active substrates design and prospected the future development direction of SERS technology.展开更多
基金Supported by the National Natural Science Foundation of China(No.11774048)the"111"Project of China(No.B13013).
文摘Gold nanostars(Au NSs)are asymmetric anisotropic nanomaterials with sharp edge structure.As a promising branched nanomaterial,Au NS has excellent plasmonic absorption and scattering properties.In order to tune the plasmonic photothermal and surface-enhanced Raman scattering(SERS)activity of Au NSs to obtain the desired characteristics,the ffects of reagents on the local surface plasmon resonance(LSPR)bands of Au NSs were studied and the morphology and size were regulated.Nanoparticles with different sharp edges were synthesized to make their local plasmon resonance mode tunable in the visible and near-infrared region.The effects of the number and sharpness of different tips under the control of AgNO3 on the photothermal response of Au NSs and the SERS ac-tivity and their mechanism were discussed in detail.The results show that as the length of the branch tip becomes longer and the sharpness increases,the plasmonic photothermal effect of Au NSs is strengthened,and the photother-mal conversion efficiency is the highest up to 40%when the length of Au NSs is the longest.Au NSs with high SERS activity are used for the Raman detection substrate.Based on this property,the quantitative detection of the pesticide thiram is achieved.
基金National Natural Science Foundation of China,Grant/Award Numbers:21875008,51801007,51876008,52022006Beijing Natural Science Foundation,Grant/Award Number:3202020。
文摘Surface‐enhanced Raman scattering(SERS)spectroscopy has renowned its fame for the ultra‐high sensitivity and single‐molecule detection ability,and listed as a fingerprint spectrum representative in various trace detection fields.Considerable efforts have been made by researchers to design high‐sensitive SERS‐active substrates ranging from noble metals to semiconductors.This review summarizes the fundamental theories for SERS technique,that is,the electromagnetic enhancement mechanism and chemical enhancement mechanism and the state‐of‐the‐art design strategies for noble metal and semiconductor substrates.It also sheds light on the effective approaches to improve the SERS activity for noble metal substrates,that is,tuning the localized surface plasmon resonance position,the assembling of hot spots,and precise controlling of nanogaps.Although charge transfer is considered as the main reason for the enhancement mechanism for semiconductors at the present stage,the underlying theoretical basis remains mysterious.This review summarized the critical points for SERS‐active substrates design and prospected the future development direction of SERS technology.
