An ordered mesoporous Ag superstructure synthesized via a template strategy for surface-enhanced Raman spectroscopy.

Surface-enhanced Raman scattering (SERS) substrates with high density and uniformity of nanogaps are proven to enhance the reproducibility and sensitivity of the Raman signal. Up to now, the syntheses of a highly ordered gold or silver superstructure with a controllable nanoparticle size and a well-defined particle gap have been quite limited. Here, we reported an ordered mesoporous silver superstructure replicated by using ordered mesoporous KIT-6 and SAB-15 as templates. By means of a nanocasting process, the ordered mesoporous Ag superstructure was successfully synthesized, which shows uniform distribution of the nanowire diameter (10 nm) and nanogap size (∼2 nm), thus exhibiting a high Raman enhancement of ∼10(9). The finite difference time-domain (FDTD) results indicate that the ordered mesoporous Ag superstructure has a uniform distribution of hot spots. Therefore, the mesoporous silica template strategy presented here could lead to a new class of high quality SERS substrates providing extraordinary potential for diverse applications.

[1]  M. Kappes,et al.  Gold mesostructures with tailored surface topography and their self-assembly arrays for surface-enhanced Raman spectroscopy. , 2010, Nano letters.

[2]  Weiyang Li,et al.  Dimers of silver nanospheres: facile synthesis and their use as hot spots for surface-enhanced Raman scattering. , 2009, Nano letters.

[3]  R. Krupke,et al.  Growth of non-branching Ag nanowiresvia ion migrational-transport controlled 3D electrodeposition , 2012 .

[4]  Xu,et al.  Electromagnetic contributions to single-molecule sensitivity in surface-enhanced raman scattering , 2000, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[5]  Sunghoon Kwon,et al.  Highly uniform and reproducible surface-enhanced Raman scattering from DNA-tailorable nanoparticles with 1-nm interior gap. , 2011, Nature nanotechnology.

[6]  Zhong-Qun Tian,et al.  Investigation of surface-enhanced Raman scattering from platinum electrodes using a confocal Raman microscope: dependence of surface roughening pretreatment , 1998 .

[7]  Zhi-yuan Li,et al.  Nanoparticle attachment on silver corrugated-wire nanoantenna for large increases of surface-enhanced Raman scattering. , 2011, ACS nano.

[8]  Andreas Otto,et al.  The ‘chemical’ (electronic) contribution to surface‐enhanced Raman scattering , 2005 .

[9]  S. Gray,et al.  Self-assembled large Au nanoparticle arrays with regular hot spots for SERS. , 2011, Small.

[10]  O. Terasaki,et al.  Shape- and size-controlled synthesis in hard templates: sophisticated chemical reduction for mesoporous monocrystalline platinum nanoparticles. , 2011, Journal of the American Chemical Society.

[11]  Dana D. Dlott,et al.  Measurement of the Distribution of Site Enhancements in Surface-Enhanced Raman Scattering , 2008, Science.

[12]  D. Zhao,et al.  Plasmonic Silver Supercrystals with Ultrasmall Nanogaps for Ultrasensitive SERS‐Based Molecule Detection , 2015 .

[13]  Zhi-yuan Li,et al.  Polyhedral silver mesocages for single particle surface-enhanced Raman scattering-based biosensor. , 2011, Biomaterials.

[14]  K. Yao,et al.  Highly Uniform and Reproducible Surface Enhanced Raman Scattering on Air-stable Metallic Glassy Nanowire Array , 2014, Scientific Reports.

[15]  Chao Zhang,et al.  Highly Sensitive, Uniform, and Reproducible Surface‐Enhanced Raman Spectroscopy from Hollow Au‐Ag Alloy Nanourchins , 2014, Advanced materials.

[16]  Hyungsoon Im,et al.  Vertically oriented sub-10-nm plasmonic nanogap arrays. , 2010, Nano letters.

[17]  Jinhuai Liu,et al.  A shrinking strategy for creating dynamic SERS hot spots on the surface of thermosensitive polymer nanospheres. , 2013, Chemical communications.

[18]  Yong Wang,et al.  Nanostructured gold films for SERS by block copolymer-templated galvanic displacement reactions. , 2009, Nano letters.

[19]  Steven R. Emory,et al.  Probing Single Molecules and Single Nanoparticles by Surface-Enhanced Raman Scattering , 1997, Science.

[20]  P. Yang,et al.  Ag nanowire formation within mesoporous silica , 2000 .

[21]  Chang Hyun Ko,et al.  Facile synthesis of highly ordered mesoporous silver using cubic mesoporous silica template with controlled surface hydrophobicity. , 2009, Chemical communications.

[22]  R. Dasari,et al.  Single Molecule Detection Using Surface-Enhanced Raman Scattering (SERS) , 1997 .

[23]  S. Nie,et al.  Single-Molecule and Single-Nanoparticle SERS: Examining the Roles of Surface Active Sites and Chemical Enhancement , 2002 .

[24]  K. Kuroda,et al.  Morphosynthesis of nanostructured gold crystals by utilizing interstices in periodically arranged silica nanoparticles as a flexible reaction field. , 2010, Angewandte Chemie.

[25]  Hongxing Xu,et al.  Spectroscopy of Single Hemoglobin Molecules by Surface Enhanced Raman Scattering , 1999 .

[26]  U. Bach,et al.  Self-assembly of vertically aligned gold nanorod arrays on patterned substrates. , 2012, Angewandte Chemie.

[27]  F. Kleitz,et al.  Cubic Ia3d large mesoporous silica: synthesis and replication to platinum nanowires, carbon nanorods and carbon nanotubes. , 2003, Chemical communications.