Haiza Haroonhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/342442024-03-28T23:47:22Z2024-03-28T23:47:22ZGreen synthesis of silver nanoparticles using local honeyHaiza, HaroonAzizan, Aziz, Assoc. Prof. Dr.Aizat Hazwan, MohidinDewi Suriyani, Che Halin, Dr.http://dspace.unimap.edu.my:80/xmlui/handle/123456789/355432014-06-16T01:57:47Z2013-05-01T00:00:00ZGreen synthesis of silver nanoparticles using local honey
Haiza, Haroon; Azizan, Aziz, Assoc. Prof. Dr.; Aizat Hazwan, Mohidin; Dewi Suriyani, Che Halin, Dr.
In this work, silver nanoparticles have been successfully prepared with a simple, cost-effective and reproducible aqueous room temperature green synthesis method. Honey was chosen as the eco-friendly reducing and stabilizing agent replacing most reported reducing agents such as hydrazine, sodium borohydride (NaBH4) and dimethyl formamide (DMF) which are highly reactive chemicals but also pose a biological risk to the society and environment. The size and shape of silver nanoparticles were modulated by varying the honey concentration and pH of the aqueous solution that contain silver nitrate as the silver precursor, sodium hydroxide as the pH regulator and ethylene glycol as the solvent. The silver nanoparticles obtained are characterized by field-emission scanning electron microscope (FESEM), ultraviolet-visible spectra (UV-Vis) and Fourier transform infrared spectroscopy (FTIR). From SEM analysis, it was found that by increasing the concentration of honey, the size of silver nanoparticles produced decreased, from the range of 18.98 nm - 26.05 nm for 10 g of honey to 15.63 nm - 17.86 nm for 40 g of honey. Similarly, the particle size decreased as the pH of the aqueous solution increased. UV-Vis spectra revealed large anisotropic and polydispersed Ag nanoparticle were produced.
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2013-05-01T00:00:00ZPreparation of photoelectrochemical cell of ITO/Cu2O/PVC-LICLO4/graphite using Cu2O films as an active layerDewi Suriyani, Che Halin, Dr.Haiza, HaroonIbrahim, Abu Talib, Prof. Dr.Abdul Razak, Daud, Prof. DrMuhammad Azmi, Abd Hamid, Assoc. Prof. Dr.http://dspace.unimap.edu.my:80/xmlui/handle/123456789/355272014-06-16T01:18:33Z2014-01-01T00:00:00ZPreparation of photoelectrochemical cell of ITO/Cu2O/PVC-LICLO4/graphite using Cu2O films as an active layer
Dewi Suriyani, Che Halin, Dr.; Haiza, Haroon; Ibrahim, Abu Talib, Prof. Dr.; Abdul Razak, Daud, Prof. Dr; Muhammad Azmi, Abd Hamid, Assoc. Prof. Dr.
Cuprous oxide (Cu2O) thin films were successfully grown on indium tin oxide (ITO) coated glass by sol-gel spin coating using diethanolamine (DEA) as a solubility agent. The films were annealed at 350 °C in 5% H2 + 95% N2 atmosphere. The films were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Based on the SEM micrograph of the as obtained film, the film shows better coverage with the four sided pyramidal shapes grain size of 108 nm. The prepared Cu2O thin film was used as an active electrode for photoelectrochemical cell of ITO/Cu2O/PVC-LiClO4/graphite. The photoelectrochemical cell was tested using current-voltage characteristic under light illumination of 100 mW/cm2.
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2014-01-01T00:00:00ZMechanism of current transport for a photoelectrochemical cells of ITO/Cu2O/PVC-LiClO4/graphiteDewi Suriyani, Che Halin, Dr.Haiza, HaroonIbrahim, Abu Talib, Prof. Dr.Abdul Razak, Daud, Prof. Dr.Muhammad Azmi, Abd Hamid, Assoc. Prof. Dr.http://dspace.unimap.edu.my:80/xmlui/handle/123456789/331382014-03-26T04:40:08Z2013-01-01T00:00:00ZMechanism of current transport for a photoelectrochemical cells of ITO/Cu2O/PVC-LiClO4/graphite
Dewi Suriyani, Che Halin, Dr.; Haiza, Haroon; Ibrahim, Abu Talib, Prof. Dr.; Abdul Razak, Daud, Prof. Dr.; Muhammad Azmi, Abd Hamid, Assoc. Prof. Dr.
This paper deals with the current transport mechanism of solid state photoelectrochemical cells of ITO/Cu2O/PVC-LiClO4/graphite as well as the physical properties of a component of a device affecting its performance. The principle of operation used in the photoelectrochemical cells is presented. The device makes use of ITO films, Cu2O films, PVC-LiClO4 and graphite films as photoanode, photovoltaic material, solid electrolyte and counter electrode, respectively. The device shows rectification. The Jsc and Voc obtained at 100 mW cm-2 were 3.2 × 10-11 mA/cm2 and 0.92 V, respectively.
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2013-01-01T00:00:00ZMicrostructures study on cuprous oxide thin films deposited on different substrates by using sol-gel techniqueDewi Suriyani, Che HalinIbrahim, Abu TalibHaiza, HaroonAbdul Razak, DaudMuhammad Azmi, Abd Hamidhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/320172014-02-19T03:53:47Z2012-12-01T00:00:00ZMicrostructures study on cuprous oxide thin films deposited on different substrates by using sol-gel technique
Dewi Suriyani, Che Halin; Ibrahim, Abu Talib; Haiza, Haroon; Abdul Razak, Daud; Muhammad Azmi, Abd Hamid
Cuprous oxide (Cu₂O) thin films were formed onto three different substrates such as indium tin oxide (ITO) coated glass, titanium oxide (TiO₂) and n-Si substrates by sol-gel spin coating technique. It was found that the formation mechanism of Cu₂O films onto different substrates lead to different microstructures. The films were characterized by field-emission scanning electron microscopy (FESEM). Based on the FESEM micrographs the grain shape of film prepared were different on ITO, TiO₂ and n-Si substrate with 114 nm, 154 nm and 84 nm respectively. The results indicate that the choice of substrate strongly affect the film morphology, structural and optical properties. Keywords: Cu₂O, thin films, ITO, sol-gel, microstructures
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2012-12-01T00:00:00Z