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Friday 30 June 2017

Larval Color Forms

Author

For further details log on website :
https://www.nrs.fs.fed.us/disturbance/invasive_species/asiangm/risk_detection_spread/larval_color_forms/

Tuesday 27 June 2017

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

References

[1]
X. Chen, J. Zhu, Z. Chen, C. Xu, Y. Wang, C. YaoA novel bienzyme glucose biosensor based on three-layer Au–Fe3O4@SiO2 magnetic nanocompositeSens. Actuator. B, 159 (2011), pp. 220-228
[2]
Y. Lili, W. Hui, W. Beina, W. Ziyi, C. Hongmei, F. Congying, J. NengqinMagnetic Fe3O4-reduced graphene oxide nanocomposites-based electrochemical biosensingNano-Micro Letters, 6 (2014), pp. 258-267
[3]
J. Li, R. Yuan, Y. ChaiSimple construction of an enzymatic glucose biosensor based on a nanocomposite film prepared in one step from iron oxide, gold nanoparticles, and chitosanMicrochim. Acta, 173 (2011), pp. 369-374
[4]
A. Kaushik, R. Khan, P.R. Solanki, P. Pandey, J. Alam, S. Ahmad, B.D. MalhotraIron oxide nanoparticles–chitosan composite based glucose biosensorBiosens. Bioelectron, 24 (2008), pp. 676-683
[5]
Y. Sahoo, A. Goodarzi, M.T. Swihart, T.Y. Ohulchanskyy, N. Kaur, E.P. Furlani, P.N. PrasadAqueous ferrofluid of magnetite nanoparticles: fluorescence labeling and magnetophoretic ontrolJ. Phys. Chem. B, 109 (2005), pp. 3879-3885
[6]
S. Nigam, K.C. Barick, D. BahadurDevelopment of citrate-stabilized Fe3O4 nanoparticles: conjugation and release of doxorubicin for therapeutic applicationsJ. Magn. Magn. Mater, 323 (2010), pp. 237-243
[7]
S. Deb, S.O. Raja, A.K. Dasgupta, R. Sarkar, A.P. Chattopadhyay, U. Chaudhuri, P. Guha, P. SardarSurface tunability of nanoparticles in modulating platelet functionsBlood Cells, Molecules, and Diseases, 48 (2011), pp. 36-44
[8]
A. Sharma, D. Baral, H.B. Bohidar, P.R. SolankiOxalic acid capped iron oxide nanorods as a sensing platformChemico-Biological Interactions, 238 (2015), pp. 129-137
[9]
N. Mohamad Nor, K. Abdul Razak, T.S. Tan, R. NoordinProperties of surface functionalized iron oxide nanoparticles (ferrofluid) conjugated antibody for lateral flow immunoassay applicationJ. Alloys Compd., 538 (2012), pp. 100-106
[10]
S. Besbes, H.B. Ouada, J. Davenas, L. Ponsonnet, N. Jaffrezic, P. AlcouffeEffect of surface treatment and functionalization on the ITO properties for OLEDsMater. Sci. Eng. C., 26 (2006), pp. 505-510
[11]
S. Alibeigi, M.R. VaeziPhase transformation of iron oxide nanoparticles by varying the molar ratio of Fe2+:Fe3+.ChemEng. Technol., 31 (2008), pp. 1591-1596
[12]
F.H. Wang, T. Yoshitake, D.K. Kim, M. Muhammed, B. Bjelke, J. KehrDetermination ofconjugation efficiency of antibodies and proteins to the superparamagnetic iron oxide nanoparticles by capillary electrophoresis with laser-induced fluorescence detectionJ. Nanopart. Res., 5 (2003), pp. 137-146
[13]
P.R. Solanki, S.K. Arya, S.P. Singh, M.K. Pandey, B.D. MalhotraApplication of electrochemically prepared poly-N-methylpyrrole-p-toluene sulphonate films to cholesterol biosensorSens. Actuators B, 123 (2007), pp. 829-839
[14]
L. Yang, X. Ren, F. Tang, L. ZhangA practical glucose biosensor based on Fe3O4 nanoparticles and chitosan/nafion composite filmBiosens. Bioelectron., 25 (2009), pp. 889-895
[15]
X. Kang, Z. Mai, X. Zou, P. Cai, J. MoA novel glucose biosensor based on immobilization of glucose oxidase in chitosan on a glassy carbon electrode modified with gold-platinum alloy nanoparticles/multiwall carbon nanotubesAnal. Biochem., 369 (2007), pp. 71-79
[16]
G. Zhao, J.J. Xu, V. ChenFabrication, characterization of Fe3O4 multilayer film and its application in promoting direct electron transfer of haemoglobin.Electrochem. Commun, 8 (2006), pp. 148-154
Peer-review under responsibility of School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia.
For further details log on website :
http://www.sciencedirect.com/science/article/pii/S1876619616001625

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

[1]
Z.A. Ghaleb, M. Mariatti, Z.M. AriffProperties of graphene nanopowder and multi-walled carbon nanotube-filled epoxy thin-film nanocomposites for electronic applications: The effect of sonication time and filler loadingComposites Part A: Applied Science and Manufacturing., 58 (2014), pp. 77-83
[2]
M.R. Zakaria, H.M. Akil, M.H.A. Kudus, S.S.M. SalehEnhancement of tensile and thermal properties of epoxy nanocomposites through chemical hybridization of carbon nanotubes and aluminaComposites Part A: Applied Science and Manufacturing., 66 (2014), pp. 109-116
[3]
M.H.A. Kudus, H.M. Akil, H. Mohamad, L.E. LoonEffect of catalyst calcination temperature on the synthesis of MWCNT–alumina hybrid compound using methane decomposition methodJournal of Alloys and Compounds., 509 (2011), pp. 2784-2788
[4]
S.S.M. Saleh, H.M. Akil, M.H. Abdul KudusSynthesis and Characterization of MWCNT/Dolomite Hybrid Compound as Potential Composite FillersAdvanced Materials Research., 620 (2012), pp. 400-404
[5]
M.H.A. Kudus, H.M. Akil, S.S.M. SalehHybrid Multiwalled Carbon Nanotubes/Minerals as Potential Fillers for Polymer CompositesAdvanced Materials Research., 620 (2012), pp. 236-240
[6]
C. Guangyu, C. QuanfangCharacterization Study of the Thermal Conductivity of Carbon Nanotube Copper NanocompositesJournal of Composite Materials., 44 (2010), pp. 2863-2873
[7]
T. Zhou, X. Wang, X. Liu, D. XiongImproved thermal conductivity of epoxy composites using a hybrid multi-walled carbon nanotube/micro-SiC fillerCarbon., 48 (2010), pp. 1171-1176
Peer-review under responsibility of School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia.
For further details log on website :
http://www.sciencedirect.com/science/article/pii/S1876619616000607

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

References

[1]
S.R. ForrestThe path to ubiquitous and low-cost organic electronic appliances on plasticNature, 428 (2004), pp. 911-918
[2]
D. Ginley, M.A. Green, R. CollinsSolar energy conversion toward 1 terawattMRS Bull, 33 (2008), pp. 355-364
[3]
W. Cao, Z. Li, Y. Yang, Y. Zheng, W. Yu, R. Afzal, J. XueSolar tree”: Exploring new form factors of organic solar cellsRenewable Energy, 72 (2014), pp. 134-139
[4]
U. SewekowNaturfarbstoffe — eine Alternative zu synthetischen Farbstoffen?Melliand Textilber., 69 (4) (1988), p. p271
[5]
S.I. AliRevival of natural dyes in AsiaJ. Soc. Dyers Color, 109 (1933), pp. 13-14
[6]
R. BrouillardThe in vivo expression of anthocyanin colour in plantsPhytochemistry, 22 (1983), pp. 1311-1323
[7]
Z. Huizhi, L. Wu, Y. Gao, T. MaDye-sensitized solar cells using 20 natural dyes as sensitizersJ Photochem Photobiol A Chem, 219 (2011), pp. 188-194
[8]
M. GrätzelDye-sensitized solar cellsJournal of Photochemistry and Photobiology C: Photochemistry Reviews, 4 (2003), pp. 145-153
[9]
M.R. NarayanReview: dye sensitized solar cells based on natural photosensitizersRenew Sustain Rev, 16 (2012), pp. 208-215
[10]
N.M. Gomez-Ortiz, I.A. Vazquez-Maldonado, A.R. Perez-Espadas, G.J. Mena-Rejon, J.A. Azamar-Barrio, G.G. OskamDye- sensitized solar cells with natural dyes extracted from achiote seedsSol Energ Mat Sol C, 94 (2010), pp. 40-44
[11]
P. Luo, H. Niu, G. Zheng, X. Bai, M. Zhang, W. WangFrom salmon pink to blue natural sensitizers for solar cells: Canna indica L., Salvia splendens, cowberry and Solanum nigrum LSpectrochim Acta A, 74 (2009), pp. 936-942
[12]
S. Furukawa, H. Iino, T. Iwamoto, K. Kukita, S. YamauchiCharacteristics of dye sensitized solar cells using natural dyeThin Solid Films, 518 (2009), pp. 526-529
[13]
P.M. Sirimanne, M.K.I. Senevirathna, E.V.A. Premalal, P.K.D.D.P. Pitigala, V. Sivakumar, K. TennakoneUtilization of natural pigment extracted from pomegranate fruits as sensitizer in solid-state solar cellsJournal of Photochemistry and Photobiology A: Chemistry, 177 (2006), pp. 324-327
[14]
M.K. Chong, K. Pita, S.T.H. SilalahiCorrelation between diffraction patterns and surface morphology to the model of oxygen diffusion into ITO filmsJournal of Materials Chemistry and Physics, 115 (2009), pp. 154-157
[15]
S.E.A. Hasiah, Ghapur, N. Amalina, A.N. Faizah, Y. Nusaibah, K. IbrahimProceeding of 9th International annual Symposium on Sustainability Science and Management. (2011), pp. 841-848
[16]
V. Sivakumar, J. Vijaeeswarri, J. Lakshmi, Anna.Effective natural dye extraction from different plant materials using ultrasound Industrial Crops and Products, 33 (2011), pp. 116-122
[17]
N.A. Nik Aziz, M.I.N. Isa, S. HasiahElectrical and Hall Effect Study of Hybrid Solar CellJournal of Clean Energy Technologies, 2 (2014), p. 4
[18]
Unknown author. 7600 series Hall system hardware references manual.
[19]
A.R.N. Laily. (2011). Hall effect and Electrical Studies of Chlorophyll – Polypyrrole Thin Films Deposited on Indium Thin Oxide. unpublished Master's thesis. Universiti Malaysia Terengganu, Kuala Terengganu, Malaysia.
[20]
A.R.N. Laily, M.I.N. Isa, H. Salleh, S. HasiahHall effect of Polypyrole-Chlorophyl blend thin film: solar cellSolid State Science and Technology, 19 (2) (2011), pp. 107-119
[21]
S. Hasiah, E.A.E.A. Ghapur, N.A. Nik Aziz, W.A. Dhafina, A. Hamizah, A.R.N. Laily, H. Che, HassanStudy the Electrical Properties and the Efficiency of Polythiophene with Dye and Chlorophyll as Bulk Hetero-Junction Organic Solar CellAdvanced Materials Research, Vol. 895 (2014), pp. 513-519
[22]
T.N.H. Lai, M.F. Herent, J. Quetin-Leclercq, T.B.T. Nguyen, H. Rogez, Y. LarondellePiceatannol, a potent bioactive stilbene, as major phenolic component in Rhodomyrtus tomentosaFood Chemistry, 138 (2013), pp. 1421-1430
[23]
K.M. DaviesPlant pigments and their manipulation Annual Plant Reviews.(14th ed.), Blackwell publishing Ltd, USA (2004)
[24]
K. Sun, W. Zhou, X. Tang, Z. Huang, F. Lou, D. ZhuEffect of the heat treatment on the infrared emissivity of indium tin oxide (ITO) FilmsApplied Surface Science, 257 (2011), pp. 9639-9642
[25]
H. Ǵomez, M.L. OlveraGa-doped ZnO thin films: Effect of deposition temperature, dopant concentration, and vacuum- thermal treatment on the electrical, optical, structural and morphological propertiesMater. Sci. Eng. B, 134 (2006), pp. 20-26
[26]
X.W. Sun, D.H. Kim, H.S. KwokUltra-thin ITO films deposited on various substrates by pulsed laser deposition,” Materials Research Society Proceedings, BostonMA, 485 (1997), pp. 267-272
[27]
S.J. Takayama, T. Sugawara, A. Tanaka, T. HimuroIndium tin oxide films with low resistivity and low internal stress. Journal of Vacuum Science Technology A, vol. 21 (4) (2003), pp. 1351-1354
[28]
S. Wang, X. Li, J. ZhangEffects of substrate temperature on the properties of heavy Ga-doped ZnO transparent conductive film by RF magnetron sputteringJournal of Physics: Conference Series, 188 (2009)012017
Peer-review under responsibility of School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia.
References

For further details log on website :
http://www.sciencedirect.com/science/article/pii/S1876619616000498

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