Characterization of TiO2 NPs/ZnO NSs heterojunction thin film on PTFE substrate growth by dip coating processElzawiei, Youssif S M; Hashim, Md Roslan; Halim, Mohd Mahadi
doi: 10.1088/1742-6596/2411/1/012003pmid: N/A
In this work, dip coating process (DCP) was used to synthesize TiO2 nanoparticles (NPs). The photocatalytic nanostructured heterojunction was formed on ZnO nanoseeds (NSs) layer grown by radio frequency (RF) sputtering on flexible Teflon (PTFE) substrate. Series of characterizations and analyses reveal the morphology, optical, and structural properties of the nanocomplexes. These include several identified peaks observed by XRD. While, UV-Vis reflectance spectroscopy, photoluminescence (PL), and FTIR were utilized to determine the opto-characteristics, and to observe the presence of functional bonds involved in the growth of the heterojunction thin film. Based on the presented results, the heterostructures relying on a flexible substrate are believed to be highly promising for photocatalytic applications.
Colorimetric Technique for Monitoring Water Stress in Palm Oil SeedlingsRaypah, Muna E.; Omar, Ahmad Fairuz; Jamlos, Mohd Faizal
doi: 10.1088/1742-6596/2411/1/012004pmid: N/A
Prevention of stress in the asymptomatic stage of the plants could result in improved crop management. In this study, the water and light stress of three oil palm seedlings (Elaeis Guineensis) was examined by assessing the leaves' colour using CIELAB colour space. The oil palm seedlings were subjected to water stress for 33 days and then to water and light stress from 55 to 78 day (for 25 days). The variation of the colour of the leaves due to water stress was discussed in detail. The approach used in this study to identify the drought stress may allow for differentiating mild environmental and severe drought stress in oil palm plants and may be used for remote field-scale estimation of plant stress resistance and health.
Examination of limonene concentrations using tapered plastic optical fiber sensorsAnbalagan, Thanigai; Haroon, Hazura; Rahim, Hazli Rafis Abdul; Johari, Siti Halma
doi: 10.1088/1742-6596/2411/1/012010pmid: N/A
A tapered plastic optic fiber (POF) was developed and demonstrated for monitoring different concentrations of limonene. The working mechanism of the sensor was dependent on the evanescent field interaction between light and the POF tapered region. The tapered POF was fabricated using a polishing-etching method to accomplish different waist diameters of 0.7 mm, 0.65 mm, 0.6 mm, 0.55 mm, and 0.5 mm in a 2 cm sensing region. The experiment was carried out with a blue LED with a wavelength of 400 nm and the output voltage was observed. As the concentration of the limonene solutions increased from 20% to 40%, 60%, 80%, and 100%, the refractive index also increased to 1.39, 1.41, 1.43, 1.44, and 1.47, respectively. The sensitivity of the sensor increased as the tapered waist diameter was reduced. The key benefits of this sensor are its ease of handling and fabrication in comparison to other types of sensors.
Peer Review Statementdoi: 10.1088/1742-6596/2411/1/011002pmid: N/A
All papers published in this volume have been reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing Publishing.• Type of peer review: Single Anonymous• Conference submission management system: Morressier and CMT• Number of submissions received: 27• Number of submissions sent for review: 26• Number of submissions accepted: 26• Acceptance Rate (Submissions Accepted / Submissions Received × 100): 96.3• Average number of reviews per paper: 1• Total number of reviewers involved: 14• Contact person for queries:Name: Ahmad Fairuz OmarEmail: [email protected]: Universiti Sains Malaysia
Specialized Colorimeter for Phenol red pH MeasurementLouis, K C; Abdul Hamid, S H F W; Raffay, R; Omar, A F
doi: 10.1088/1742-6596/2411/1/012020pmid: N/A
The phenol red is commonly used in cell culture medium as visual pH indicator by changing its color from darker red color to the orange-yellowish color as the pH is changing from neutral to acidic level. The color change of phenol red is hardly to be determined by using naked eyes that will be interpreted differently by different person. Thus, this study is executed to develop a specialized colorimeter for phenol red pH measurement by using Raspberry Pi as a microcontroller unit, green LED as a light source and photodiode in tandem with capacitor as a light sensor. The Raspberry Pi calculated the capacitor charging time which is in relative to the amount of light sensed by the photodiode. Based on the results, the capacitor charging time can be related to the pH value by using non-linear relationship with high accuracy of R2 = 0.8946 and RMSE = 0.4447. This study successfully introduced the development of low-cost system for phenol red pH measurement by applying the capacitor charging time which is in correspond with the absorbance value.
Performance Evaluation of NRZ-OOK and Carrier-Less Amplitude Phase Modulation in Li-Fi EnvironmentZaiton, A M; Joyce, Y P L; Ahmad, Z; Jasman, F; Hassan, W H W
doi: 10.1088/1742-6596/2411/1/012016pmid: N/A
Light Fidelity (Li-Fi) is a wireless technology that utilizes light emitting diodes to convey data. Li-Fi has emerged as a promising alternative to radio frequency communication technology in recent years. This paper examines the performance characterisation between NRZ-OOK and carrier-less amplitude-phase modulation (CAP-2, CAP-4 and CAP-8), within a simulated Li-Fi environment. For the parameters of interest, the eye pattern, bit error rate (BER) and constellation diagram are reported. As no distance is specified in the simulation, the BER for CAP is zero, allowing an ideal transmission to be emulated. The scatter diagram increases as the number of CAP modulations increases. For the eye pattern, CAP modulation provides a better visual representation of how noise might affect system performance compared to OOK modulation.
Ex-situ doping of ZnO structures as potential random lasersAzmi, Atiqah Nabieha; Yong, Pung Swee; Ahmad Kamil, Wan Maryam Wan
doi: 10.1088/1742-6596/2411/1/012009pmid: N/A
Zinc oxide (ZnO) nanorods were formed on a glass substrate using chemical bath deposition (CBD) method for three hours at 96 °C. Doping of aluminum (Al) was realised by dipping into aluminum nitrate solution. XRD spectra shows reduced (002) peak related to the crystallinity of the synthesized ZnO with increasing doping concentrations. Doping with 35 mM exhibited highest Al concentration of 11.78 %. An apparent shift in bandgap energy with increasing doping concentration provides further evidence of doping occurring in the sample. Random lasing was observed at a pumping threshold of 9.0 mW and spectral width of 1.09 nm. Overall results indicate promising potential for random lasing to occur in ZnO nanorods doped under ex-situ doping conditions.