Electroassisted Codeposition of Sol-Gel Derived Silica Nanocomposite Directs the Fabrication of Coral-like Nanostructured Porous Gold

被引:26
作者
Farghaly, Ahmed A. [1 ]
Collinson, Maryanne M. [1 ]
机构
[1] Virginia Commonwealth Univ, Dept Chem, Richmond, VA 23284 USA
关键词
NANOPOROUS GOLD; ELECTROCHEMICAL CODEPOSITION; FILM ELECTRODES; THIN-FILMS; HIERARCHICAL POROSITY; FACILE FABRICATION; SIO2/SI SYSTEM; SURFACE-AREA; NANOPARTICLES; POLYMER;
D O I
10.1021/la500614g
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Herein, we report on a one-step coelectrodeposition method to form gold-silica nanocomposite materials from which high surface area nanostructured gold electrodes can be produced. The as-prepared Au-SiO2 films possess an interconnected three-dimensional porous framework with different silica-gold ratios depending on the deposition solutions and parameters. Chemical etching of the nanocomposite films using hydrofluoric acid resulted in the formation of nanostructured porous gold films with coral-like structures and pores in the nanometer range. The cross-linkage of the gold coral branches resulted in the generation of a porous framework. X-ray photoelectron spectroscopy confirms the complete removal of silica. Well-controlled surface area enhancement, film thickness, and morphology were achieved by manipulating the deposition parameters, such as potential, time, and gold ion and sol-gel monomer concentrations in the deposition solution. An enhancement in the surface area of the electrode up to 57 times relative to the geometric area has been achieved. The thickness of the as-prepared Au-SiO2 nanocomposite films is relatively high and varied from 8 to 15 mu m by varying the applied deposition potential while the thickness of the coral-like nanostructured porous gold films ranged from 0.22 to 2.25 mu m. A critical sol-gel monomer concentration (CSGC) was determined at which the deposited silica around the gold coral was able to stabilize the coral-like gold nanostructures, while below the CSGC, the coral-like gold nanostructures were unstable and the surface area of the nanostructured porous gold electrodes decreased.
引用
收藏
页码:5276 / 5286
页数:11
相关论文
共 58 条
[1]   Recent advances in nanostructured chemosensors and biosensors [J].
Asefa, Tewodros ;
Duncan, Cole T. ;
Sharma, Krishna K. .
ANALYST, 2009, 134 (10) :1980-1990
[2]   ELECTROCHROMIC POLYMERS COVALENTLY ANCHORED TO ELECTRODE SURFACES - OPTICAL AND ELECTROCHEMICAL PROPERTIES OF A VIOLOGEN-BASED POLYMER [J].
BOOKBINDER, DC ;
WRIGHTON, MS .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1983, 130 (05) :1080-1087
[3]   THERMODYNAMICALLY UPHILL REDUCTION OF A SURFACE-CONFINED N,N'-DIALKYL-4,4'-BIPYRIDINIUM DERIVATIVE ON ILLUMINATED PARA-TYPE SILICON SURFACES [J].
BOOKBINDER, DC ;
WRIGHTON, MS .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1980, 102 (15) :5123-5125
[4]  
Callister W.D., 2004, FUNDAMENTALS MAT SCI, V2nd
[5]   The Sol-Gel Route to Advanced Silica-Based Materials and Recent Applications [J].
Ciriminna, Rosaria ;
Fidalgo, Alexandra ;
Pandarus, Valerica ;
Beland, Francois ;
Ilharco, Laura M. ;
Pagliaro, Mario .
CHEMICAL REVIEWS, 2013, 113 (08) :6592-6620
[6]  
Collinson M.M., 2013, ISRN Analytical Chemistry, V2013, P21, DOI DOI 10.1155/2013/692484
[7]   Electrochemistry: An important tool to study and create new sol-gel-derived materials [J].
Collinson, Maryanne M. .
ACCOUNTS OF CHEMICAL RESEARCH, 2007, 40 (09) :777-783
[8]   Bioanalysis based on nanoporous materials [J].
Dai, Zhihui ;
Ju, Huangxian .
TRAC-TRENDS IN ANALYTICAL CHEMISTRY, 2012, 39 :149-162
[9]   Precision measurements of the lattice constants of twelve common metals [J].
Davey, WP .
PHYSICAL REVIEW, 1925, 25 (06) :753-761
[10]   Electrochemically deposited sol-gel-derived silicate films as a viable alternative in thin-film design [J].
Deepa, PN ;
Kanungo, M ;
Claycomb, G ;
Sherwood, PMA ;
Collinson, MM .
ANALYTICAL CHEMISTRY, 2003, 75 (20) :5399-5405