Enhancement of ZnO-rGO nanocomposite thin films by gamma radiation for E. coli sensor

2017 ◽  
Vol 392 ◽  
pp. 1134-1143 ◽  
Author(s):  
Noor Azwen Noor Azmy ◽  
Ahmad Ashrif A. Bakar ◽  
Norhana Arsad ◽  
Sarada Idris ◽  
Abdul Rahman Mohmad ◽  
...  
Keyword(s):  
Thin Films ◽  
Gamma Radiation ◽  
E Coli ◽  
Nanocomposite Thin Films

An electrochemical sensor based on PANI-Ag1-x-Fex nanocomposite thin films irradiated by 10 kGy of gamma ray for E. coli detection applications

2021 ◽  
pp. 1-9
Author(s):  
Huda Abdullah ◽  
Muhamad Aiman Kamarudin ◽  
Norshafadzila Mohammad Naim ◽  
Aidil Abdul Hamid ◽  
Mohd Hafiz Dzarfan Othman
Keyword(s):  
Thin Films ◽  
Electrochemical Sensor ◽  
Gamma Ray ◽  
E Coli ◽  
Nanocomposite Thin Films

scholarly journals Thermal Annealing Effect on Structural, Morphological, and Sensor Performance of PANI-Ag-Fe Based ElectrochemicalE. coliSensor for Environmental Monitoring

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Norshafadzila Mohammad Naim ◽  
H. Abdullah ◽  
Akrajas Ali Umar ◽  
Aidil Abdul Hamid ◽  
Sahbudin Shaari
Keyword(s):  
Thin Films ◽  
Thermal Annealing ◽  
Electrochemical Impedance ◽  
Oxidative Polymerization ◽  
Reduction Process ◽  
Absorption Bands ◽  
E Coli ◽  
Sensor Performance ◽  
Vis Spectroscopy ◽  
Nanocomposite Thin Films

PANI-Ag-Fe nanocomposite thin films based electrochemicalE. colisensor was developed with thermal annealing. PANI-Ag-Fe nanocomposite thin films were prepared by oxidative polymerization of aniline and the reduction process of Ag-Fe bimetallic compound with the presence of nitric acid and PVA. The films were deposited on glass substrate using spin-coating technique before they were annealed at 300°C. The films were characterized using XRD, UV-Vis spectroscopy, and FESEM to study the structural and morphological properties. The electrochemical sensor performance was conducted usingI-Vmeasurement electrochemical impedance spectroscopy (EIS). The sensitivity upon the presence ofE. coliwas measured in clean water andE. colisolution. From XRD analysis, the crystallite sizes were found to become larger for the samples after annealing. UV-Vis absorption bands for samples before and after annealing show maximum absorbance peaks at around 422 nm–424 nm and 426 nm–464 nm, respectively. FESEM images show the diameter size for nanospherical Ag-Fe alloy particles increases after annealing. The sensor performance of PANI-Ag-Fe nanocomposite thin films uponE. colicells in liquid medium indicates the sensitivity increases after annealing.

Characterization and Fabrication of Nanocomposite Thin Films of PANI Embedded with Ag-Mn Alloy for E. coli Sensor

2016 ◽  
Vol 3 (2) ◽  
pp. 538-544 ◽  
Author(s):  
Huda Abdullah ◽  
Norshafadzila Mohammad Naim ◽  
Aidil Abdul Hamid ◽  
Akrajas Ali Umar
Keyword(s):  
Thin Films ◽  
E Coli ◽  
Nanocomposite Thin Films

Ag-Fe Alloy Nanoparticles Embedded in Polyaniline Nanocomposite Thin Films for E. coli Monitoring Sensor

2015 ◽  
Vol 1119 ◽  
pp. 101-105 ◽  
Author(s):  
Huda Abdullah ◽  
Norshafadzila Mohammad Naim ◽  
Noor Azwen Noor Azmy ◽  
Akrajas Ali Umar ◽  
Aidil Abdul Hamid ◽  
...  
Keyword(s):  
Thin Films ◽  
Bimetallic Nanoparticles ◽  
Oxidative Polymerization ◽  
Reduction Process ◽  
Alloy Nanoparticles ◽  
Absorption Bands ◽  
Visible Absorption ◽  
E Coli ◽  
Nanocomposite Thin Films ◽  
Uv Visible

The nanocomposite of polyaniline (PANI) and bimetallic nanoparticles of silver and iron were prepared by the oxidative polymerization of aniline and the reduction process of bimetallic compound with the presence of nitric acid and PVA. The nanocomposite thin films in various compositions were deposited using spin-coating technique. The films were characterized by UV-visible spectroscopy to study the optical and structural properties. The microphotograph from TEM image shows the nanospherical of Ag-Fe alloy particles in 5 – 25 nm diameter size. The sensitivity performance was tested using I-V measurement to obtain the changes of resistivity before and after the incubation with E. coli bacteria in water. UV-visible absorption bands show the single absorbance peak at 422 – 424 nm in each band indicating the Ag-Fe alloy nanoparticles form. I-V characteristic shows the sample which contains Fe-rich Ag-Fe alloy performed high sensitivity on E. coli.

Fabrication and Characterization of PANI-Ag-Co Nanocomposite Thin Films as Microbial Sensor for E. coli Detection

2016 ◽  
Vol 846 ◽  
pp. 641-649 ◽  
Author(s):  
Norshafadzila Mohammad Naim ◽  
Huda Abdullah ◽  
Noor Azwen Noor Azmy ◽  
Akrajas Ali Umar ◽  
Aidil Abdul Hamid ◽  
...  
Keyword(s):  
Thin Films ◽  
Oxidative Polymerization ◽  
Aniline Monomer ◽  
E Coli ◽  
Microbial Sensor ◽  
Alloy Particles ◽  
Vis Spectroscopy ◽  
Nanocomposite Thin Films ◽  
Before And After ◽  
Xrd Patterns

Conducting polymers are excellent host materials for nanoparticles of metals and semiconductors. PANI-Ag-Co nanocomposite was prepared by chemical oxidative polymerization of aniline monomer in the presence of nitric acid. PANI-Ag-Co thin films were deposited on the glass substrate using spin-coating technique. The films were characterized by UV-Vis spectroscopy, XRD, AFM and TEM to analyze the internal structure and surface morphology. The performance of the sensor was conducted using I–V measurement to obtain the changes in the current before and after the incubation with E. coli bacteria in water. In UV-visible absorbance bands, a single peak appears at 421.6 nm in each band indicating the Ag-Co alloy nanoparticles were formed. The peaks in the XRD patterns show the crystals are oriented along (111) planes for Ag while (200) plane for Co. AFM images indicate the surface roughness of the PANI-Ag-Co films decreases when the concentration of Co increased. TEM image shows spherical shaped of Ag-Co alloy particles with diameter in the range of 6 – 10 nm. I–V measurements show that the current change of the films increased when incubated in E. coli. The sensitivity on E. coli increases as we increase the Co concentration. PANI-Ag-Co nanocomposite thin films can be explored further for microbial sensor application in future study.

scholarly journals PANI-Ag-Cu Nanocomposite Thin Films Based Impedimetric Microbial Sensor for Detection ofE. coliBacteria

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Huda Abdullah ◽  
Norshafadzila Mohammad Naim ◽  
Noor Azwen Noor Azmy ◽  
Aidil Abdul Hamid
Keyword(s):  
Thin Films ◽  
Electrochemical Impedance ◽  
Oxidative Polymerization ◽  
Face Centered Cubic ◽  
Cu Nanoparticles ◽  
Visible Spectroscopy ◽  
High Concentration ◽  
E Coli ◽  
Nanocomposite Thin Films ◽  
Uv Visible

PANI-Ag-Cu nanocomposite thin films were prepared by sol-gel method and deposited on the glass substrate using spin coating technique. Polyaniline was synthesized by chemical oxidative polymerization of aniline monomer in the presence of nitric acid. The films were characterized using XRD, FTIR, and UV-Visible spectroscopy. The performance of the sensor was conducted using electrochemical impedance spectroscopy to obtain the change in impedance of the sensor film before and after incubation withE. colibacteria in water. The peaks in XRD pattern confirm the presence of Ag and Cu nanoparticles in face-centered cubic structure. FTIR analysis shows the stretching of N–H in the polyaniline structure. The absorption band from UV-Visible spectroscopy shows high peaks between 400 nm and 500 nm which indicate the presence of Ag and Cu nanoparticles, respectively. Impedance analysis indicates that the change in impedance of the films decreases with the presence ofE. coli. The sensitivity onE. coliincreases for the sample with high concentration of Cu.

Effect of Gamma Radiation on ZnO Doped PVA Nanocomposite Thin Films for Escherichia coli Sensor

2015 ◽  
Vol 1107 ◽  
pp. 687-692 ◽  
Author(s):  
Noor Azwen Noor Azmy ◽  
Huda Abdullah ◽  
Norshafadzila Mohammad Naim ◽  
Aidil Abdul Hamid ◽  
Sahbudin Shaari ◽  
...  
Keyword(s):  
Thin Films ◽  
Escherichia Coli ◽  
Atomic Force Microscopy ◽  
Gamma Radiation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Current Voltage ◽  
Nanocomposite Thin Films

The effect of gamma radiation on fabricated ZnO doped PVA nanocomposite thin films for determination of Escherichia coli has been investigated. Thin films of ZnO doped PVA were exposed to 60Co γ-radiation source at difference dose rate, ranging from 0 to 30 kGy at room temperature. The structural, morphological and electrical properties of the sample were investigated using X-ray diffraction (XRD), Atomic force microscopy (AFM) and Current-voltage (I-V) measurement. The X-ray diffraction (XRD) spectra have been performed to see the formation of crystal phases of all pure ZnO thin films. The diffraction patterns reveal the good crystalline quality and indicate the crystallization of the ZnO-PVA films strongly depends on radiation dose. The roughness of the thin film surface which can be seen by conducting Atomic force microscopy (AFM) measurement became smoother as the gamma radiation increased. The presence of Escherichia coli as a bacterial contamination in water was identified by measuring the changes of conductivity of thin films using current–voltage (I-V) measurement. The sensitivity of the sensors has been observed to be higher at a higher radiation dose.

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