Silica Sol–Gel Optical Biosensors: Ultrahigh Enzyme Loading Capacity on Thin Films via Kinetic Doping

2017 ◽  
Vol 121 (9) ◽  
pp. 2121-2126 ◽  
Author(s):  
Matthew S. Crosley ◽  
Wai Tak Yip
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Silica Sol ◽  
Optical Biosensors ◽  
Loading Capacity ◽  
Enzyme Loading

Fabrication of photo-crosslinkable polymer/silica sol–gel hybrid thin films as versatile barrier films

2016 ◽  
Vol 38 ◽  
pp. 61-66 ◽  
Author(s):  
Joonwon Bae ◽  
Jiyeon Lee ◽  
Chul Soon Park ◽  
Oh Seok Kwon ◽  
Chang-Soo Lee
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Silica Sol ◽  
Barrier Films ◽  
Hybrid Thin Films

The Influencing Factors for the Thickness of Silica Sol-Gel Film by the Dip Coating Process

2014 ◽  
Vol 597 ◽  
pp. 165-169
Author(s):  
Jie Hong Lei ◽  
Ri Dong Zhang
Keyword(s):  
Thin Films ◽  
Surface Roughness ◽  
Refractive Index ◽  
Sol Gel ◽  
Dip Coating ◽  
Silica Sol ◽  
Coating Process ◽  
Power Functions ◽  
Withdrawal Speed ◽  
Gel Film

The porous sol-gel silica thin films were prepared on silicon substrate by the dip coating process. The surface roughness and microstructure of the film was measured by optical microscopy and AFM .Coating thickness and refractive index were measured by ellipsometry method. Influence of withdrawal speed and concentration of colloid was investigated for the thickness of silica. The relation of the thickness and withdrawal speed was fitted by the linear and power functions, and the results were analyzed and compared. It was found that the films with the same thickness prepared by different concentrations of colloid have different refractive indexes. The experimental results indicated that the thickness and refractive index of the film can be controlled by changing the withdrawal speed and colloid concentration.

scholarly journals Determination of growth kinetics and size dependent structural, morphological, optical characteristics of sol-gel derived silica nanoparticles in silica matrix

2019 ◽  
Vol 37 (1) ◽  
pp. 16-24
Author(s):  
Bengü Özuğur Uysal ◽  
Fatma Z. Tepehan
Keyword(s):  
Thin Films ◽  
Silica Nanoparticles ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Silica Film ◽  
Silica Sol ◽  
Nano Silica ◽  
Silica Films ◽  
Annealing Temperatures ◽  
Silica Thin Films

AbstractNanocomposite silica thin films made using the sol-gel method were studied. The nano-silica films were prepared using a mixture of tetraethyl orthosilicate (TEOS), deionized water, ethanol, and ammonia solution. To control the growth of the particles inside the film, the nanocomposite silica film was prepared using a mixture of the nano-silica sol and the silica sol. The change in the particle size with the heat treatment temperature ranging from 450 °C to 1100 °C was investigated. X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), NKD (refractive index-N, extinction coefficient-K, and thickness-D) and ultraviolet-visible (UV-Vis) spectrophotometry were used for characterization purposes. The XRD studies showed that the nano-silica thin films were amorphous at all annealing temperatures except for 1100 °C. The_-cristobalite crystal structure formed at the annealing temperature of 1100 °C. Optical parameters, such as refractive indices and extinction coefficients, were obtained using the NKD analyzer with respect to the annealing temperature of the films. The activation energy and enthalpy of the nanocomposite silica film were evaluated as 22.3 kJ/mol and 14.7 kJ/mol, respectively. The cut-off wavelength values were calculated by means of extrapolation of the absorbance spectra estimated using the UV-Vis spectroscopy measurements. A red shift in the absorption threshold of the nanocomposite silica films indicated that the size of the silica nanoparticles increased with an increase of the annealing temperatures from 450 °C to 900 °C, and this confirms the quantum confinement effect in the nanoparticles.

scholarly journals Kinetically Doped Silica Sol–Gel Optical Biosensors: Expanding Potential Through Dip-Coating

ACS Omega ◽  
2018 ◽  
Vol 3 (7) ◽  
pp. 7971-7978 ◽  
Author(s):  
Matthew S. Crosley ◽  
Wai Tak Yip
Keyword(s):  
Sol Gel ◽  
Dip Coating ◽  
Silica Sol ◽  
Optical Biosensors
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