ORCID Profile
0000-0003-2436-8953
Current Organisation
Universiti Putra Malaysia
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Publisher: Elsevier BV
Date: 2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6CP05950C
Abstract: Au–Ag@TiO 2 were prepared using a simple one-step chemical reduction method and used as photoanodes in high-efficiency DSSCs.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4RA11356J
Abstract: A silver incorporated graphene oxide nanocomposite was prepared and used for the detection of biomolecules using an absorbance based optical sensing method.
Publisher: Wiley
Date: 07-04-2015
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 03-2016
DOI: 10.1016/J.JHAZMAT.2015.11.004
Abstract: A newly developed CdS/rGO/CC electrode was prepared based on a flexible carbon cloth (CC) substrate with cadmium sulfide (CdS) nanoparticles and reduced graphene oxide (rGO). The CdS was synthesized using an aerosol-assisted chemical vapor deposition (AACVD) method, and the graphene oxide was thermally reduced on the modified electrode surface. The existence of rGO in the CdS-modified electrode increased the photocurrent intensity of the CdS/rGO/CC-modified electrode by three orders of magnitude, compared to that of the CdS/ITO electrode and two orders of magnitude higher than the CdS/CC electrode. A new visible-light-prompt photoelectrochemical sensor was developed based on the competitive binding reaction of Cu(2+) and CdS on the electrode surface. The results showed that the effect of the Cu(2+) on the photocurrent response was concentration-dependent over the linear ranges of 0.1-1.0 μM and 1.0-40.0 μM with a detection limit of 0.05 μM. The results of a selectivity test showed that this modified electrode has a high response toward Cu(2+) compared to other heavy metal ions. The proposed CdS/rGO/CC electrode provided a significantly high potential current compared to other reported values, and could be a practical tool for the fast, sensitive, and selective determination of Cu(2+).
Publisher: Elsevier BV
Date: 10-2015
Publisher: Hindawi Limited
Date: 04-02-2015
DOI: 10.1002/ER.3307
Publisher: European Optical Society
Date: 18-05-2014
Publisher: Elsevier BV
Date: 11-2017
Publisher: Elsevier BV
Date: 11-2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4RA13777A
Abstract: In this review, the recent progress in the electrochemical sensing of dopamine with various graphene and their nanocomposite materials modified electrodes are presented.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2016
Publisher: Springer Science and Business Media LLC
Date: 15-10-2015
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2018
Publisher: Optica Publishing Group
Date: 03-2017
DOI: 10.1364/OE.25.005509
Publisher: Elsevier BV
Date: 2015
Publisher: IOP Publishing
Date: 20-03-2019
Publisher: Elsevier BV
Date: 12-2016
Publisher: Elsevier BV
Date: 07-2017
Publisher: IEEE
Date: 03-2016
Publisher: MDPI AG
Date: 21-08-2020
DOI: 10.3390/S20174713
Abstract: The need for environmental protection and water pollution control has led to the development of different sensors for determining many kinds of pollutants in water. Ammonia nitrogen presence is an important indicator of water quality in environmental monitoring applications. In this paper, a high sensitivity sensor for monitoring ammonia nitrogen concentration in water using a tapered microfiber interferometer (MFI) as a sensor platform and a broad supercontinuum laser as the light source is realized. The MFI is fabricated to the waist diameter of 8 µm producing a strong interference pattern due to the coupling of the fundamental mode with the cladding mode. The MFI sensor is investigated for a low concentration of ammonia nitrogen in water in the wide wavelength range from 1500–1800 nm with a high-power signal provided by the supercontinuum source. The broad source allows optical sensing characteristics of the MFI to be evaluated at four different wavelengths (1505, 1605, 1705, and 1785 nm) upon exposure towards various ammonia nitrogen concentrations. The highest sensitivity of 0.099 nm pm that indicates the wavelength shift is observed at 1785 nm operating wavelength. The response is linear in the ammonia nitrogen range of 5–30 ppm with the best measurement resolution calculated to be 0.5 ppm. The low concentration ammonia nitrogen detected by the MFI in the unique infrared region reveals the potential application of this optical fiber-based sensor for rivers and drinking water monitoring.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7RA00342K
Abstract: Cr 1−x Al x N coatings, synthesised by an unbalanced magnetic sputtering system, showed improved microstructure and mechanical properties for ∼14–21% Al content.
Publisher: The Optical Society
Date: 12-05-2017
DOI: 10.1364/OME.7.001858
Publisher: Elsevier BV
Date: 2020
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2018
Publisher: MDPI AG
Date: 14-01-2021
DOI: 10.3390/S21020556
Abstract: Ammonia detection in ambient air is critical, given its implication on the environment and human health. In this work, an optical fiber tapered to a 20 µm diameter and coated with graphene oxide was developed for absorbance response monitoring of ammonia at visible (500–700 nm) and near-infrared wavelength regions (700–900 nm). The morphology, surface characteristics, and chemical composition of the graphene oxide s les were confirmed by a field emission scanning electron microscope, an atomic force microscope, X-ray diffraction, and an energy dispersion X-ray. The sensing performance of the graphene oxide-coated optical microfiber sensor towards ammonia at room temperature revealed better absorbance response at the near-infrared wavelength region compared to the visible region. The sensitivity, response and recovery times at the near-infrared wavelength region were 61.78 AU/%, 385 s, and 288 s, respectively. The sensitivity, response and recovery times at the visible wavelength region were 26.99 AU/%, 497 s, and 192 s, respectively. The selectivity of the sensor towards ammonia was affirmed with no response towards other gases.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TB00924D
Abstract: Discovering the distinctive photophysical properties of semiconductor nanoparticles (NPs) has made these a popular subject in recent advances in nanotechnology-related analytical methods.
Publisher: Informa UK Limited
Date: 19-11-2015
Publisher: Springer Science and Business Media LLC
Date: 04-04-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA02608C
Abstract: An electrochemical sensing platform based on a hydrothermally synthesized rGO–Co 3 O 4 @Pt nanocomposite was developed for the detection of in situ generated NO.
Publisher: Elsevier BV
Date: 02-2020
Publisher: Penerbit UTM Press
Date: 21-02-2016
DOI: 10.11113/JT.V78.7526
Abstract: The presence of plumbous (Pb2+) in Irrigation water is harmful for the environment as well as human health. Herein, a simple yet effective sensor for Pb2+ detection is presented utilizing a surface plasmon resonance technique. The proposed sensor consists of a combination of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) were attached to a gold layer offers a new option for heavy metal detection. The EDC/NHS works as a sensing layer that able to detect Pb2+ down to 15 ppm that matches with the United States Environment Protection Agency.
Publisher: Hindawi Limited
Date: 2016
DOI: 10.1155/2016/1949042
Abstract: A polypyrrole-nanoparticles reduced graphene oxide nanocomposite layer was prepared using electrochemical method. The prepared s les were characterized using Fourier transform infrared spectroscopy, field emission scanning electron microscopy, and UV-visible spectroscopy. The band gap of nanocomposite layers was calculated from UV-visible spectra and the thermal diffusivity of layers was measured using a photoacoustic technique. As experimental results, the optical band gap was in the range between 3.580 eV and 3.853 eV, and thermal diffusivity was increased with increasing the layer thickness from 2.873 cm 2 /s to 12.446 cm 2 /s.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA01928A
Abstract: The potential usage of different types of carbon nanomaterials such as carbon nanofiber (CNF), carbon nanotube (CNT) and graphene (G) flake and also CNF–G and CNT–G on the carbon fiber (CF) surface as fillers in composites, is discussed in this paper.
Publisher: American Chemical Society (ACS)
Date: 24-12-2018
Publisher: Elsevier BV
Date: 06-2017
No related grants have been discovered for Hong Ngee Lim.