Optimized Electroless Silver Coating for Optical and Plasmonic Applications

Electroless metal deposition is a simple and convenient technique to fabricate metallic films and to provide isotropic metal functionalization of 3D structures with complex geometries. In this work, we describe the synthesis of silver coatings by means of a modified Tollens reaction and their use as optical coating. The chemical composition of the metallization bath is here addressed to optimize the metal coating deposition. The synthesis parameters have been tailored in order to deposit very smooth films which were characterized by scanning electron microscopy, atomic force microscopy, and optical spectroscopy. 2D diffraction gratings and sinusoidal plasmonic gratings were produced with the proposed method. Optical characterization confirmed the plasmonic activities of the resultant structures, proving the efficiency of the described method for optical applications. Thermal annealing was found to improve the surface roughness of the coating and therefore the optical properties of the plasmonic gratings.

[1]  P. Griffiths,et al.  Electroless Deposition of Silver onto Silicon as a Method of Preparation of Reproducible Surface-Enhanced Raman Spectroscopy Substrates and Tip-Enhanced Raman Spectroscopy Tips , 2010, Applied spectroscopy.

[2]  A. Mewe,et al.  Ellipsometric study of percolation in electroless deposited silver films , 2007 .

[3]  O. Stéphan,et al.  Electroless growth of silver nanoparticles into mesostructured silica block copolymer films. , 2010, Langmuir.

[4]  Younan Xia,et al.  Synthesis and characterization of stable aqueous dispersions of silver nanoparticles through the Tollens process , 2002 .

[5]  M. Fouda,et al.  Deposition of durable thin silver layers onto polyamides employing a heterogeneous Tollens’ reaction , 2010 .

[6]  M. Demirel,et al.  Fabrication and Use of Electroless Plated Polymer Surface-Enhanced Raman Spectroscopy Substrates for Viral Gene Detection , 2010 .

[7]  B. Jia,et al.  Two-Photon Polymerization for Three-Dimensional Photonic Devices in Polymers and Nanocomposites , 2007 .

[8]  B. Jia,et al.  Three-dimensional hybrid photonic crystals merged with localized plasmon resonances. , 2010, Optics express.

[9]  E. Palik.  Handbook of Optical Constants of Solids , 1997 .

[10]  Hong Xia,et al.  Metal-nanoshelled three-dimensional photonic lattices. , 2008, Optics letters.

[11]  N. Ming,et al.  A facile colloidal templating method to monodisperse hollow Ag and Ag/Au submicrometer spheres , 2006 .

[12]  C. Andraud,et al.  Void and grain resonances in discontinuous silver thin films close to the percolation threshold , 2000 .

[13]  Satoshi Kawata,et al.  Selective electroless plating to fabricate complex three-dimensional metallic micro/nanostructures , 2006 .

[14]  Stephen M. Kuebler,et al.  Fabrication and Characterization of Three‐Dimensional Silver‐Coated Polymeric Microstructures , 2006 .

[15]  C. Sukenik,et al.  Controlled fabrication of silver or gold nanoparticle near-field optical atomic force probes: Enhancement of second-harmonic generation , 2002 .

[16]  Robin L. McCarley,et al.  Selective Deposition of Metals on Plastics Used in the Construction of Microanalytical Devices: Photo-Directed Formation of Metal Features on PMMA† , 2001 .

[17]  Dezhen Wu,et al.  Reflective and conductive surface‐silvered polyimide films prepared by surface graft copolymerization and electroless plating , 2008 .

[18]  Wolfgang Knoll,et al.  Azimuthal dispersion and energy mode condensation of grating-coupled surface plasmon polaritons , 2008 .

[19]  A. Stanishevsky,et al.  Electroless silver plating on spin-coated silver nanoparticle seed layers , 2006 .

[20]  Hua Qi,et al.  Plasmonic coupling on dielectric nanowire core–metal sheath composites , 2010, Nanotechnology.

[21]  C. Zhang,et al.  Synthesis of Ag-coated polystyrene colloids by an improved surface seeding and shell growth technique , 2006 .

[22]  S. Kuebler,et al.  Route to Three-Dimensional Metallized Microstructures Using Cross-Linkable Epoxide SU-8 , 2007 .