83 research outputs found
Pembudayaan stem pelajar ulul albab melalui modul sains forensik
Pelbagai pendekatan pendidikan dewasa ini dilaksanakan selaras dengan fokus Kementerian Pendidikan dan tuntutan masyarakat di Malaysia untuk memberi penekanan terhadap pendidikan berteraskan pengajian Al-Quran, As-Sunnah serta sains dan teknologi
UPMSTEM menganjurkan 'Arduino for Classroom' untuk guru-guru UAE
SERDANG - Sains Teknologi Kejuruteraan Matematik UPM (UPMSTEM), IEEE Litar dan Sistem (CAS) Malaysia serta MidEast Malaysia Training Sdn. Bhd., baru-baru ini telah menganjurkan 'Arduino for Classroom', suatu program khidmat masyarakat dengan aktiviti praktikal untuk lapan orang guru bidang-STEM dari dari Suruhanjaya Diraja Kerajaan Arab Saudi bagi Jubail dan Yanbu (RCJY), UAE
UPMSTEM tingkat kemahiran sensorial anak-anak pendidikan khas
BUKIT BERUNTUNG, 23 April – Seramai 78 anak-anak berkeperluan khas (MBK) dan lebih 1,600 orang murid tahap rendah aliran perdana menyertai aktiviti hands-on dalam slot karnival STREAM dan slot Science Magic Show di Sekolah Kebangsaan Bukit Beruntung 2 (SKBB2), di sini
Effect of deposition time on the morphology and structural properties of indium antimonide nanowires (InSb) by template assisted electrodeposition
Semiconductor InSb nanowire have been synthesized by the typical three-electrode electrochemical cell. The deposition is from tartaric acid aqueous solution into anodic alumina oxide (AAO) at different time deposition varies from 15 to 40 mins with constant deposition potential of -1.5 V. The morphology and structural properties of InSb nanowires were studied using XRD and FESEM equipped with EDX. The nanowires have diameter varying and the length of the template assisted InSb nanowires varied from the deposition time of 15 to 40 mins, from 100 to 200 nm respectively. The length of synthesized InSb nanowires increases from 1.8 to 5.5 μm with the increasing deposition time of 15 to 40 min. The XRD analysis shows that the diffraction peaks of nanowires are on a plane (111) and (220). Based on the elemental composition from the EDX, almost stoichiometric composition with ratio 1:1.1 was achieved for the samples deposited for 35 and 40 minutes
Piezoelectric properties of zinc oxide nanostructure synthesized via chemical bath solution
We report our investigation on the growth of ZnO nanostructure on a patterned interdigitated microelectrode (IDE) using chemical bath deposition (CBD). Piezoresponse force microscopic techniques were used to characterise the piezoelectric material domain of the grown ZnO nanostructures. The synthesised ZnO nanostructures exhibits a hexagonal wurtzite structure with the c-axis preferred crystal orientation in the (002) plane. The average thickness of the ZnO seed layer was 467.5 nm, whereas the diameter and length of ZnO nanostructure were measured to be 2.73 μm and 6.96 μm respectively. The combine effect of Zinc nitrate and HTMA concentration and seed layer thickness are considered as the main reason for crystal morphology evolution. The ZnO nanostructures exhibited a phase switch of the response and hysteresis in the plot of phase versus dc voltage, as evidenced by the polarization exchanging of its ferroelectric behaviour. These results provide a fundamental understanding of piezoresponse ZnO nanostructure for future energy applications
Ellipsometric study of Si1-x Gex alloy
A report on ellipsometric studies of Si0.5 Ge0.5 and Si0.7 Ge0.3 thin films is described. The samples were earlier prepared from SiGe disks of 3” diameter using RF magnetron sputtering and the films were deposited onto glass substrates at room temperature. Some of the optical properties were investigated using an ellipsometer. In this method, we investigate the changes in refractive indices, n and extinction coefficients, k with film thickness as well as the relevant dielectric constant, ε. The results showed that, at a wavelength of 632.80 nm, n was found to increase with an increase of the germanium contents
Growth of InP nanowires on silicon using a thin buffer layer
InP nanowires (NWs) are grown on Si substrate using a thin inter-mediate buffer layer. The buffer layer is grown in two steps. An initial nucleation layer is crucial to accommodate the lattice mismatch between InP and Si. A high quality 2nd layer is grown on this initial layer with smooth morphology suitable for the NW growth. More than 97% vertical yield is achieved on the buffer layer and the morphology and photoluminescence of the NWs are similar to those grown on InP(111)B substrate
Combined optical trapping and microphotoluminescence of single InP nanowires
In this letter, we demonstrate that microphotoluminescence may be combined with optical trapping
for effective optical characterization of single target InP semiconductor nanowires in suspension.
Using this technique, we may investigate structural properties of optically trapped nanowires, such
as crystalline polytypes and stacking faults. This arrangement may also be used to resolve structural
variations along the axis of the trapped nanowire. These results show that photoluminescence
measurements may be coupled with optical tweezers without degrading the performance of the
optical trap and provide a powerful interrogation tool for preselection of components for nanowire
photonic devices.We thank the Australian Research Council for the financial
support of this research
A glassy carbon electrode modified with tailored nanostructures of cobalt oxide for oxygen reduction reaction
Herein we report on various surface morphological characteristics of the synthesized cobalt oxide (Co3O4) nanostructures obtained by means of facile one-step hydrothermal method for oxygen reduction reaction (ORR). The synthesized nanostructures of Co3O4 were adequately characterized by field emission scanning electron microscopy (FESEM) fitted with Energy-dispersive X-ray spectroscopy (EDX) elemental mapping, X-ray diffraction (XRD) and Raman techniques. The electrochemical studies were carried out to analyse the performance of as-synthesized catalysts for ORR by cyclic voltammetry (CV), and chronoamperometric (CA) techniques. A higher electrocatalytic response was observed for Co3O4 nanocubes compared with all the other controlled electrodes by CV with a current density of 0.69 mA/cm2 at a potential value of −0.46 V. The as-synthesized material showed adequate tolerance against methanol observed by CV in the presence of 0.5 M methanol, and good stability when compared with commercial Pt/C catalyst using the CA technique
Tapered multimode fiber sensor for ethanol sensing application
Ethanol is a widely used chemical in the industry which can be volatile and flammable. However, the availability of optical sensors for ethanol is still in its maturing stage. In this project, a tapered multimode fiber optic sensor for detection of ethanol with different concentrations in water was developed. The working principle of the sensor is based on absorption spectroscopy in the visible wavelength ranges. The tapered multimode fiber was fabricated using Vytran glass processing workstation to achieve waist diameter and length of 40 μm and 20 mm, respectively. Upon exposure to ethanol concentrations of ranges 5% to 40%, the developed fiber sensor absorbance increases linearly. The sensor shows fast response and recovery as low as 14 s and 27 s, respectively
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