Template Sol-Gel Synthesis of Phosphorescent Mesoporous Silica Film Nanocomposites Using an Amphiphilic Gold (I) Pyrazolate Complex

2011 ◽  
Vol 364 ◽  
pp. 55-59 ◽  
Author(s):  
Hendrik O. Lintang ◽  
Kazushi Kinbara ◽  
Takuzo Aida
Keyword(s):  
Mesoporous Silica ◽  
Sol Gel ◽  
Silica Film ◽  
Aqueous Alcohol ◽  
Molar Ratios ◽  
Silica Source ◽  
Aqueous Alcohol Solution ◽  
Mesoporous Silica Film ◽  
Sol Gel Synthesis ◽  
Film Nanocomposites

Herein novel mesoporous silica film nanocomposites are successfully synthesized by using phosphorescent columnar assembly of an amphiphilic trinuclear gold (I) pyrazolate complex [Au3Pz3] as a functional template in the sol-gel synthesis. By controlling the molar ratios of silica source tetrabutylorthosilicate (TBOS) to [Au3Pz3] in an acidic aqueous alcohol solution from 60:1 to 20:1, highly ordered phosphorescent nanocomposites can be fabricated with hexagonal [Au3Pz3]/silicahexand lamellar [Au3Pz3]/silicalamsilicates.

scholarly journals Effect of acidic aqueous alcohol solution on template sol-gel synthesis of phosphorescent hexagonal mesoporous silica film nanocomposite

2014 ◽  
Vol 7 (1) ◽  
Author(s):  
Henrik O. Lintang ◽  
Kazushi Kinbara ◽  
Takuzo Aida
Keyword(s):  
Mesoporous Silica ◽  
Sol Gel ◽  
Stokes Shift ◽  
Silica Film ◽  
Alcohol Solution ◽  
Aqueous Alcohol ◽  
Hexagonal Mesoporous Silica ◽  
Aqueous Alcohol Solution ◽  
Mesoporous Silica Film ◽  
Sol Gel Synthesis

Here novel mesoporous silica film nanocomposite with a hexagonal structure is successfully synthesized by using phosphorescent columnar assembly of a trinuclear gold(I) pyrazolate complex bearing amphiphilic side chains [Au3Pz3], formed via a weak AuI-AuI metallophilic interaction, as a functional template in the sol-gel synthesis. By controlling the molar ratios of alcohol to acid in an acidic aqueous alcohol solution, the sol-gel synthesis of columnar assembled [Au3Pz3] with a silica source can provide highly ordered hexagonal mesoporous silica film composite [Au3Pz3]/silicahex consisting one-dimensional molecular assembly in the nanoscopic channels. The as-fabricated silica film nanocomposite [Au3Pz3]/silicahex with red emission have phosphorescent properties with luminescence emission centered at 693 nm (ext = 276 nm; Stokes shift,  = 417 nm) and lifetime at 7.8 s (ext = 266 nm, em = 690 nm).

Synthesis of Mesoporous Silica Nanocomposites for Preparation of Gold Nanoparticles

2014 ◽  
Vol 925 ◽  
pp. 233-237 ◽  
Author(s):  
Mohamad Azani Jalani ◽  
Leny Yuliati ◽  
Salasiah Endud ◽  
Hendrik Oktendy Lintang
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Mesoporous Silica ◽  
Sol Gel ◽  
Average Particle Size ◽  
Silica Film ◽  
Cubic Phase ◽  
Average Particle ◽  
Interpore Distance ◽  
Sol Gel Synthesis

Gold nanoparticles (AuNPs) having particle size less than 10 nm can exhibit enhancement of surface area to give high activity such as in catalytic reaction. However, it is hard to synthesize AuNPs with small particle size due to the strong agglomeration. Herein we report that channels of mesoporous silica synthesized via the template sol-gel synthesis can be used to prepare AuNPs by calcination method. Mesoporous silica with an interpore distance of 4.1 nm was successfully fabricated as transparent thin film by using an amphiphilic trinuclear gold (I) pyrazolate complex as a template for the sol-gel synthesis. Upon calcination at 450 °C for 3 h, silica film nanocomposites showed red-shifting of surface plasmon resonance (SPR) bands from 518 (AuNPs from the bulk) to 544 nm owing to decreasing of the average particle size. The formation of AuNPs was also supported by the appearance of diffraction peaks of d111 at 2θ = 38.20° having a cubic phase. Moreover, transmission electron microscope (TEM) images and X-ray diffraction (XRD) peaks also showed smaller and more homogenous distribution of AuNPs.

Preparation of a Mesoporous Silica Film with a Strictly Aligned Porous Structure through a Sol−Gel Process

2005 ◽  
Vol 17 (21) ◽  
pp. 5323-5327 ◽  
Author(s):  
Hirokatsu Miyata ◽  
Yasuhiro Kawashima ◽  
Miki Itoh ◽  
Masatoshi Watanabe
Keyword(s):  
Mesoporous Silica ◽  
Porous Structure ◽  
Sol Gel ◽  
Silica Film ◽  
Sol Gel Process ◽  
Mesoporous Silica Film

Sol-gel synthesis and characterization of Ag nanoparticles in ZrO2 thin films

2009 ◽  
Vol 24 (8) ◽  
pp. 2541-2546 ◽  
Author(s):  
Eisuke Yokoyama ◽  
Hironobu Sakata ◽  
Moriaki Wakaki
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Composite Films ◽  
Dip Coating ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Silver Surface ◽  
Molar Ratios ◽  
Sol Gel Synthesis

ZrO2 thin films containing silver nanoparticles were prepared using the sol-gel method with Ag to Zr molar ratios [Ag]/[Zr] = 0.11, 0.25, 0.43, 0.67, 1.00, 1.50, and 2.33. After dip coating on glass substrate, coated films were annealed at 200 and 300 °C in air. X-ray diffraction peaks corresponding to crystalline Ag were observed, but a specific peak corresponding to ZrO2 was not observed. At the molar ratio [Ag]/[Zr] = 0.25, the particle size of Ag distributed broadly centered at 17 nm for an annealing temperature of 200 °C and at 25 nm for 300 °C. The films annealed in air at 200 °C showed an absorption band centered at 450 nm because of the silver surface plasmon resonance, whereas films heated at 300 °C in air caused a red shift of the absorption to 500 nm. The absorption peak was analyzed using the effective dielectric function of Ag-ZrO2 composite films modeled with the Maxwell-Garnett expression.

scholarly journals Selective Detection of Cysteine at a Mesoporous Silica Film Electrode Functionalized with Ferrocene in the Presence of Glutathione

2020 ◽  
Vol 7 (9) ◽  
pp. 2095-2101
Author(s):  
Himanshu Maheshwari ◽  
Neus Vilà ◽  
Grégoire Herzog ◽  
Alain Walcarius
Keyword(s):  
Mesoporous Silica ◽  
Silica Film ◽  
Selective Detection ◽  
Film Electrode ◽  
Mesoporous Silica Film
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