【摘 要】
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Compared with pure gold nanoparticles(Au NPs)/silver nanoparticle(Ag NPs)-based surface-enhanced Raman spectroscopy(SERS)substrates with relatively low enha
【机 构】
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Institute of Functional Nano & Soft Materials(FUNSOM),Soochow University,Suzhou 215123,P.R.China
【出 处】
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The 6th International Conference on Nanoscience and Technolo
论文部分内容阅读
Compared with pure gold nanoparticles(Au NPs)/silver nanoparticle(Ag NPs)-based surface-enhanced Raman spectroscopy(SERS)substrates with relatively low enhancement factor(EF)values(e.g.,~104-5)and poor reproducibility,the silicon nanohybrids show higher EF values(e.g.,~106-7)due to their high-efficacy SERS hot spots efficiently coupled through semiconducting silicon substrates,significantly facilitating the enhancement of EF values and improvement of the detection limit.[1] In addition,metal NPs can be tightly immobilized on silicon substrates,effectively avoiding the random aggregation of free Au/Ag NPs,resulting in relatively good reproducibility(e.g.,RSD<17%).[1] Consequently,a variety of silicon nanohybrids,such as Ag NPs decorated silicon wafer(Ag NPs@Si)and Au NPs decorated silicon nanowire array(Au NPs@SiNWAr)have been designed and served as new SERS substrates for the construction of new types of high-quality sensors,allowing ultrahigh sensitivity and specific detection of various chemical and biological species(e.g.,Hg2+,DNA,cell and bacteria)in reliable and reproducible manners.
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