n-Type porous silicon as an efficient surface enhancement Raman scattering substrate

Abstract. Highly active and sensitive surface-enhanced Raman scattering (SERS) substrates were prepared by n-type (1 to 10  Ω·cm in resistivity) porous silicon (PS) substrates of Ag nanoparticles. SERS studies were carried on these substrates with R6G as a test molecule with a λex=785  nm laser. We optimized the fabrication procedure, which is easy and rapid, for nanostructured silver particles on the surface of PS. The maximum of SERS enhancement for R6G is observed for PS with an anodization current density of 6  mA/cm2 and an etching time of 8 min. The detection limit for R6G absorbed on Ag-coated PS (Ag-PS) is 10 nM and SERS spectra show that the Ag-PS substrate has high SERS activity. The larger pore diameter of this new Ag-PS substrate is expected and the size of the pore diameter is about 1.2 μm, which permits better biomolecule infiltration. This new Ag-PS substrate can be applied in SERS in biochemical and biomedical fields.

[1]  Luke P. Lee,et al.  Surface‐Enhanced Raman Scattering of Small Molecules from Silver‐Coated Silicon Nanopores , 2003 .

[2]  G. Upender,et al.  Silver nanocluster films as novel SERS substrates for ultrasensitive detection of molecules , 2011 .

[3]  Li Wang,et al.  DNA-network-templated self-assembly of silver nanoparticles and their application in surface-enhanced Raman scattering. , 2005, The journal of physical chemistry. B.

[4]  L. Canham.  Silicon quantum wire array fabrication by electrochemical and chemical dissolution of wafers , 1990 .

[5]  Fabrizio Giorgis,et al.  SERS‐active substrates based on silvered porous silicon , 2009 .

[6]  M. Fleischmann,et al.  Raman spectra of pyridine adsorbed at a silver electrode , 1974 .

[7]  Yehuda Zeiri,et al.  Silver Nanoparticles Deposited on Porous Silicon as a Surface-Enhanced Raman Scattering (SERS) Active Substrate , 2012, Applied spectroscopy.

[8]  P. Hildebrandt,et al.  Surface-enhanced resonance Raman spectroscopy of Rhodamine 6G adsorbed on colloidal silver , 1984 .

[9]  Michael S. Feld,et al.  Single-Molecule Detection of a Cyanine Dye in Silver Colloidal Solution Using Near-Infrared Surface-Enhanced Raman Scattering , 1998 .

[10]  K. Kholostov,et al.  SERS-active substrates based on n-type porous silicon , 2010 .

[11]  Louis E. Brus,et al.  Ag Nanocrystal Junctions as the Site for Surface-Enhanced Raman Scattering of Single Rhodamine 6G Molecules , 2000 .

[12]  X. Xia,et al.  One-step formation of nanostructured gold layers via a galvanic exchange reaction for surface enhancement Raman scattering , 2006 .

[13]  R. Dasari,et al.  Population pumping of excited vibrational states by spontaneous surface-enhanced Raman scattering. , 1996, Physical review letters.

[14]  J. A. Creighton,et al.  ANOMALOUSLY INTENSE RAMAN SPECTRA OF PYRIDINE AT A SILVER ELECTRODE , 1977 .

[15]  K. Buddharaju,et al.  DNA detection using nanostructured SERS substrates with Rhodamine B as Raman label. , 2008, Biosensors & bioelectronics.

[16]  Effect of dopant type on immersion plating into porous silicon layer , 1999 .

[17]  Dmitry S. Koktysh,et al.  Dual-mode sensing platform based on colloidal gold functionalized porous silicon , 2010 .

[18]  K. Kholostov,et al.  Formation of SERS-active silver structures on the surface of mesoporous silicon , 2009 .

[19]  David R. Smith,et al.  Surface-Enhanced Raman Scattering from Silver-Plated Porous Silicon , 2004 .

[20]  Biswajit Mondal,et al.  Fabrication of SERS substrate using nanoporous anodic alumina template decorated by silver nanoparticles , 2010 .