Study of ITO Glass Electrode Modified with Iron Oxide Nanoparticles and Nafion for Glucose Biosensor Application

Published Date
Available online 24 March 2016.

Author
Noorhashimah Mohamad Nor. Author links open the author workspace.Zainovia Lockman. Author links open the author workspace.Khairunisak Abdul Razak. Author links open the author workspace.Opens the author workspaceOpens the author workspace

School of Materials and Mineral Resources Engineering Universiti Sains Malaysia, Nibong Tebal, Penang 14300 Malaysia

Abstract

In this study, we report the fabrication of the indium tin oxide (ITO) glass electrode modified with iron oxide nanoparticles (IONPs) and nafion for glucose biosensor applications. The IONPs was synthesized using the precipitation method and functionalized with citric acid (CA) to provide hydrophilic surface and functional group for glucose oxidase (GOx) enzyme immobilization. The structural and morphological studies of CA-IONPs were characterized using X-ray diffractometer (XRD) and transmission electron microscope (TEM). The size of the IONPs measured from TEM image was ∼17 nm. The bioelectrode designated as Nafion/GOx/CA-IONPs/ITO was developed by drop casting of the CA-IONPs, GOx and nafion on the ITO glass. The Nafion/GOx/CA-IONPs/ITO bioelectrode showed good electrochemical performance for glucose detection. The functionalized CA-IONPs acted as the catalyst and help to improve the electron transfer rate between GOx and ITO electrode. In addition, thin nafion film was coated on the electrode to prevent interference and improve chemical stability. The Nafion/GOx/CA-IONPs/ITO bioelectrode showed high sensitivity of 70.1 μAmM-1cm-2 for the linear range of 1.0-8.0 mM glucose concentrations.

Keywords

Iron oxide nanoparticles

glucose biosensor

citric acid

nafion

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ArticlePDF (1MB)

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Effect of Different Hybrid Method on Properties of Carbon Nanotubes/Dolomite Hybrid Filled Phenolic Composites

Published Date
Available online 24 March 2016.

Author
Siti Shuhadah Md. Saleh. Author links open the author workspace.a. Numbers and letters correspond to the affiliation list. Click to expose these in author workspaceb. Numbers and letters correspond to the affiliation list. Click to expose these in author workspaceHazizan Md. Akil. Author links open the author workspace.Opens the author workspaceOpens the author workspacea. Numbers and letters correspond to the affiliation list. Click to expose these in author workspacec. Numbers and letters correspond to the affiliation list. Click to expose these in author workspaceMuhammad Helmi Abdul Kudus. Author links open the author workspace.a. Numbers and letters correspond to the affiliation list. Click to expose these in author workspaceKhairel Rafezi Ahmad. Author links open the author workspace.b. Numbers and letters correspond to the affiliation list. Click to expose these in author workspaceNur Suraya Anis Ahmad Bakhtiar. Author links open the author workspace.a. Numbers and letters correspond to the affiliation list. Click to expose these in author workspace

a

School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia

b

School of Materials Engineering, Universiti Malaysia Perlis, 02600 Jejawi, Perlis, Malaysia

c

Cluster for Polymer Composite (CPC), Science and Engineering Research Center, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia

Abstract

Hybridization of multi wall carbon nanotubes (MWCNTs) with other filler in polymer matrix composites (PMC) is one of the techniques for combining different properties of fillers for making more unique composites. In this work, the hybrid filler (CNTs–dolomite) are prepared via chemical vapour deposition (CVD hybrid) and the milling method (physically hybrid). The effect of different hybrid method on properties of multi wall carbon nanotubes/dolomite hybrid filled phenolic composites were studied. Phenolic/CVD hybrid composites and phenolic/physically hybrid composites with different filler loadings were prepared using hot mounting press. The prepared samples were characterized for their thermal conductivity and hardness. The thermal conductivity was measured using the Transient Plane Source (TPS) method, using a Hot-DiskTM Thermal Constant Analyzer and the hardness was measured using Rockwell micro-hardness. The results showed that at 5% filler loading, the phenolic/CVD hybrid composites were capable of increasing the thermal conductivity and micro-hardness up to 7.22% and 101.6% respectively compared to pure phenolic.

Keywords

hybrid

polymer composite

carbon nanotube

chemical vapour deposition

References

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ArticlePDF (1MB)

[2]

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ArticlePDF (3MB)

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ArticlePDF (1MB)

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ArticlePDF (386KB)

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Poly (3-Dodecylthiophene)/Natural Dye Bulk Heterojunction Organic Solar Cell: An Electrical Conductivity, and Hall Effect Study

Published Date
Available online 24 March 2016.

Author
A.R.N. Laily. Author links open the author workspace.a. Numbers and letters correspond to the affiliation list. Click to expose these in author workspaceS. Hasiah. Author links open the author workspace.Opens the author workspaceb. Numbers and letters correspond to the affiliation list. Click to expose these in author workspaceN.A. Nik Aziz. Author links open the author workspace.a. Numbers and letters correspond to the affiliation list. Click to expose these in author workspaceA.N. Dagang. Author links open the author workspace.a. Numbers and letters correspond to the affiliation list. Click to expose these in author workspace

a

School of Ocean Engineering, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia

b

Centre for Foundation and Liberal Education, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia

Abstract

Today, world is facing the increasing energy demand, security of energy supply and reduction of emissions. Energy consumption which accounts for 60% global greenhouse gas emissions has mainly contributed to climate change. Renewable energy is an appropriate way to satisfy energy consumption without environmental degradation. Solar energy is one of the most promising renewable energy sources today. In recent years, organic solar cells (OSCs) which are a promising alternative to conventional inorganic devices have received much attention. In this research, OSCs are developed from organic material; Pulasan (Nephelium mutabile Labill), Kemunting (Rhodomyrtus tomentosa) and Poly (3- Dodecylthiophene) (P3DT). These OSCs are facbricated accordingly bulk heterojunction of ITO/P3DT+natural dye/Au via electrochemical method at room temperature. The OSCs was deposited onto heated substrate from 50 ̊C to 200 ̊C. From four point probes (FPP) data revealed that electrical conductivity increases by the increment of light intensity and temperature of substrate. Then, the samples were examined using Hall Effect measurement to obtain the type of sample, Hall mobility, and highest charge carrier in the sample of OSCs. Both samples detected was N-type of charge carrier from Hall effect measurement.

Keywords

Natural Dyes

Electrical Properties

and Organic Solar Cell

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References

For further details log on website :
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