scholarly journals The Effects of Potentiostat Scan Rate Variation on Impedance Value, Topography, and Morphology of the Polyaniline Thin Film

2021 ◽  
Vol 6 (2) ◽  
pp. 46-54
Author(s):  
Iqomatus Sa'diyah ◽  
◽  
Nugrahani Primary Putri ◽  
Keyword(s):  
Thin Film ◽  
Electron Microscope ◽  
Quartz Crystal ◽  
Homogeneous Layer ◽  
Rate Variation ◽  
Inhomogeneous Layer ◽  
Impedance Analyzer ◽  
Damping Effect ◽  
Scan Rate ◽  
Scanning Electron

The effects of potentiostat scan rate on the impedance, topography, and morphology of the Polyaniline (PANi) thin film has observed in this study. PANi has deposited on the Quartz Crystal Microbalance (QCM) surface with various scan rates, and changes in the impedance value have observed through an impedance analyzer test. Topography Measurement System (TMS) has observed the layer topography, while the layer morphology has observed using optical microscopy and Scanning Electron Microscope (SEM). The results have shown that the best sample has a scan rate of 10 mV/s, with a low impedance value indicating the layer has rigid. The variation in scan rate can affect the impedance value, but it is not significant and does not indicate a damping effect on QCM. A homogeneous layer is deposited at a low scan rate from topography and morphological observations, while a high scan rate results in an inhomogeneous layer.

Functionality of ZnPc Thin Film Deposited on Polystyrene Interlayer for Immobilization of Biomolecules in QCM Based Biosensor

2015 ◽  
Vol 827 ◽  
pp. 266-270 ◽  
Author(s):  
D.J. Djoko H. Santjojo ◽  
Masruroh ◽  
Sri Widyarti ◽  
Fadli Robiandi
Keyword(s):  
Thin Film ◽  
Surface Roughness ◽  
Electron Microscope ◽  
Bovine Serum Albumin ◽  
Scanning Electron Microscope ◽  
Film Thickness ◽  
Quartz Crystal ◽  
Thermal Evaporation ◽  
Complex Adsorption ◽  
Scanning Electron

Functionality of zinc pthalocyanine (ZnPc) thin film for immobilization of biomolecules was studied using bovine serum albumin (BSA). The functionality is affected by microstructures and surface roughness of the film. This studies is conducted by producing ZnPc films by means of thermal evaporation in vacuum. The ZnPc films were deposited on quartz crystal substrates with a polystyrene interlayer. Observations were carried out using a scanning electron microscope and an optical micro-profilometry. Enhancement of the functionality is observed with the increase of the film thickness. Surface roughness and microstructures of the film influence the functionality in a complex way. Adsorbtion of the BSA molecules is associated with both the surface roughness and microstructures. Although generally the adsorption is proportional to the contact area but the roughness and fibrous microstructures of the deposited ZnPc produce complex adsorption and trapping mechanisms in the immobilization of the BSA.

scholarly journals Improvement QCM Quality By Polystyrene Coating and Bovine Serum Albumin as Immobilization Agent

2019 ◽  
Vol 8 (1) ◽  
pp. 35-41 ◽  
Author(s):  
Lalu A. Didik ◽  
Yahdi Yahdi ◽  
Masruroh Masruroh
Keyword(s):  
Thin Film ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Spin Coating ◽  
Bovine Serum ◽  
Quartz Crystal ◽  
Measuring System ◽  
Frequency Shifts ◽  
Impedance Analyzer ◽  
Coating Method

Polystyrene (PS) thin film with various concentration of mass (1%, 3%, and 5%) has been deposited onto Quartz Crystal Microbalance (QCM)  surface by a spin coating method. The purpose of this research is the improvement of Bovine Serum Albumin (BSA) immobilization into the QCM surface. The QCM resonance frequency has been investigated by means of Impedance Analyzer. The film thickness was calculated by the Sauerbrey equation. The surface roughness of the PS layer was observed by noncontact Topography Measuring System (TMS-1200). Calculation result using a Sauerbrey equation shows the thickness of the PS layer increases with the increasing PS concentration. The QCM/PS with 1% and 5% concentration of mass has rougher morphology and more frequency shifts caused by BSA injection compared to 3% concentration of PS

The Photoluminescence Spectra Research of SiC Thin Film under Different Sputtering Powers

2019 ◽  
Vol 295 ◽  
pp. 93-97
Author(s):  
Chang Zhao ◽  
Man Zhao ◽  
Su Ye Lv ◽  
Qing Jun Liu ◽  
Guang Jian Xing
Keyword(s):  
Thin Film ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Crystal Morphology ◽  
Growth Conditions ◽  
Photoluminescence Spectra ◽  
Experimental Conditions ◽  
Grain Sizes ◽  
Power Inputs ◽  
Scanning Electron

This study prepared an SiC thin film by using the ratio frequency magnetron sputtering method, investigated the effects of different sputtering powers on the SiC material and analysed the changes in crystal morphology and photoluminescence characteristics caused by changes in the growth conditions used. It was considered that there was 6H-SiC crystal morphologies in the SiC thin film under the experimental conditions prevailing in this study. The SiC morphologies with small grain sizes intermingled and therefore formed anSiC thin film. The analyses of the photoluminescence spectra and Scanning Electron Microscope indicated that the SiC thin film materials with preferable crystal compositions could be prepared under appropriate power inputs.

scholarly journals On the Influence of Applied Fields on Spinel Formation

1999 ◽  
Vol 586 ◽  
Author(s):  
C. Korte ◽  
J. K. Farrer ◽  
N. Ravishankar ◽  
J. R. Michael ◽  
H. Schmalzried ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Microscope ◽  
Solid State ◽  
Electric Fields ◽  
Phase Boundaries ◽  
Electron Backscattered Diffraction ◽  
Backscattered Electron ◽  
Applied Fields ◽  
Mgo Substrate ◽  
Scanning Electron

ABSTRACTInterfaces play an important role in determining the effect of electric fields on the mechanism of the formation of spinel by solid-state reaction. The reaction occurs by the movement of phase boundaries but the rate of this movement can be affected by grain boundaries in the reactants or in the reaction product. Only by understanding these relationships will it be possible to engineer their behavior. As a particular example of such a study, Mgln2O4 can be formed by the reaction between single-crystal MgO substrate and a thin film of In2O3with or without an applied electric field. High-resolution backscattered electron (BSE) imaging and electron backscattered diffraction (EBSD) in a scanning electron microscope (SEM) has been used to obtain complementary chemical and crystallographic information.

Mucilaginous film production by plant cells immobilised in a polyurethane or nylon matrix

1985 ◽  
Vol 63 (12) ◽  
pp. 2357-2363 ◽  
Author(s):  
M. J. C. Rhodes ◽  
R. J. Robins ◽  
R. J. Turner ◽  
J. I. Smith
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Plant Cells ◽  
The Matrix ◽  
Nylon Fibre ◽  
Scanning Electron

The surface features of plant cells immobilised in a matrix of either reticulated polyurethane foam or nylon fibre have been examined with the scanning electron microscope. It has been found that both cells and matrix are enveloped in a thin film, the appearance of which is very dependent on the method by which material is prepared for scanning electron microscopy. The structure is severely damaged by fixation and dehydration. Only in specimens examined in the frozen hydrated state is a structure seen compatible with that observed with the light microscope. From the way the appearance of the film is affected by different methods of preparation for the scanning electron microscope, it is suggested that the film is a hydrated mucilage. The importance of this film for the retention of cells within the matrix is discussed.

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