Can supervise: YES
Lee, PLT, Kanodarwala, FK, Lennard, C, Spindler, X, Spikmans, V, Roux, C & Moret, S 2020, 'Latent fingermark detection using functionalised silicon oxide nanoparticles: Optimisation and comparison with cyanoacrylate fuming', Forensic Science International, vol. 315.View/Download from: Publisher's site
© 2020 Elsevier B.V. Among the different types of nanoparticles (NPs) proposed for fingermark detection, silicon oxide nanoparticles (SiO2 NPs) are arguably the most promising due to their unique characteristics. In this study, carboxyl-functionalised SiO2 NPs doped with luminescent ruthenium complex—RuBpy-doped CES-SiO2 NPs—were further studied to investigate their effectiveness for latent fingermark detection. A modified version of the functionalised SiO2 NPs with a lower amount of surface functionalisation is proposed for improved fingermark detection effectiveness. A shaking incubator was also incorporated into the fingermark detection process to offer a more viable treatment approach in comparison to the previously published method. The shaking incubator offered a more robust application approach, as well as improved fingermark detection quality. To gain an insight into fingermark detection effectiveness relative to benchmark techniques, the performance of the optimised RuBpy-doped CES-SiO2 NPs was compared to that of a benchmark fingermark detection method—cyanoacrylate fuming (CAF) followed by luminescent dye staining. Relative fingermark detection effectiveness across the two techniques was evaluated via the treatment of 1724 fingermark specimens. It was concluded that, in general, the benchmark method provided superior detection results. It was evident that the SiO2 NPs are less affected by donor variability but are more dependent on substrate types. Such characteristics are encouraging as they could be favourable to practitioners in casework scenarios where the substrate is known but donor variability is obscure prior to fingermark processing. It should be noted that the overall effectiveness of the proposed NP-based technique will need to be improved before it could be considered for operational implementation.
Kanodarwala, FK, Moret, S, Spindler, X, Lennard, C & Roux, C 2019, 'Nanoparticles used for fingermark detection—A comprehensive review', Wiley Interdisciplinary Reviews: Forensic Science, vol. 1, no. 5.View/Download from: Publisher's site
Lee, PLT, Kanodarwala, FK, Lennard, C, Spindler, X, Spikmans, V, Roux, C & Moret, S 2019, 'Latent fingermark detection using functionalised silicon oxide nanoparticles: Method optimisation and evaluation.', Forensic science international, vol. 298, pp. 372-383.View/Download from: Publisher's site
The application of nanoparticles for latent fingermark detection has been reported in the literature over the past two decades. One of the nanoparticles that shows promise to become a routine technique is functionalised silicon oxide nanoparticles (SiO2 NPs). In a recent optimisation of the technique, the use of carboxyl-functionalised SiO2 NPs doped with luminescent ruthenium complex was proposed as a breakthrough for latent fingermark detection. In this study, the aforementioned functionalised SiO2 NPs were extensively evaluated. Modification and optimisation of the original detection parameters were performed to enhance detection quality and improve applicability. Various detection parameters were evaluated and assessed. A lower concentration of the functionalised nanoparticles used in the colloidal dispersion was determined to offer improved detection effectiveness. A combination of increased bath temperature and reduced immersion time was found to produce good overall results. A set of modified detection parameters was suggested for the use of the functionalised SiO2 NPs to detect latent fingermarks. Performance of the modified detection parameters was compared against that of the published detection method. Comparison experiments were carried out on fingermark specimens deposited on aluminium foil, transparent polypropylene plastic and green polyethylene plastic. Three donors (weak, average and strong) and two age intervals (ten days and three months) were considered in the comparison study. Evaluation of the results suggested that the overall performance of the modified method for latent fingermark detection was superior to that obtained using the previously published detection parameters.
Majeed, I, Manzoor, U, Kanodarwala, FK, Nadeem, MA, Nadeem, MA, Hussain, E, Ali, H, Badshah, A & Stride, JA 2018, 'Pd-Ag decorated g-C3N4 as an efficient photocatalyst for hydrogen production from water under direct solar light irradiation', Catalysis Science and Technology, vol. 8, no. 4, pp. 1183-1193.View/Download from: Publisher's site
© The Royal Society of Chemistry. A low visible light absorption efficiency and high recombination rate of photogenerated charge carriers are two major problems encountered in graphitic carbon nitride (g-C3N4) based photocatalysts for water splitting applications. In this work, Pd-Ag bimetallic and monometallic nanoparticles were decorated on graphitic carbon nitride by a simple chemical reduction method and evaluated for their ability to produce H2 during water splitting reactions. The physical and photophysical characteristics of the as-prepared Pd-Ag/g-C3N4 photocatalysts were studied by powder X-ray diffraction (PXRD), UV-visible diffuse reflection spectroscopy (DRS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), energy dispersive spectroscopy (EDS) and steady state photoluminescence (PL). The Pd0.7-Ag0.3/g-C3N4 photocatalyst with an overall metal loading of 1 wt% showed a very high H2 generation rate of 1250 μmol h-1 g-1, which is 1.5 and 5.7 times higher than those of the Pd/g-C3N4 and Ag/g-C3N4 photocatalysts, respectively. The high activity of the Pd-Ag/g-C3N4 photocatalyst was attributed to the inherent property of palladium metal to quench photogenerated electrons by the Schottky barrier formation mechanism and strong visible light absorption due to the characteristic surface plasmon resonance (SPR) of silver nanoparticles along with the absorption of g-C3N4.
Ali, H, Zaman, S, Majeed, I, Kanodarwala, FK, Nadeem, MA, Stride, JA & Nadeem, MA 2017, 'Porous Carbon/rGO Composite: An Ideal Support Material of Highly Efficient Palladium Electrocatalysts for the Formic Acid Oxidation Reaction', ChemElectroChem, vol. 4, no. 12, pp. 3126-3133.View/Download from: Publisher's site
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Catalyst support materials play an important role in the electrochemical performance of the catalyst in fuel cells. Herein, we present a synergistic effect of surface area and electronic conductivity on the efficiency of a carbon support material towards its application in direct formic acid fuel cells. A composite of reduced graphene oxide (rGO) and metal organic framework (MOF-5) derived porous carbon (PC) was used as a novel support material for a high dispersion of palladium nanoparticles. The rGO 1 -C 1 electrocatalyst, which consists of an equal ratio of PC and rGO, was found to be the most effective for the formic acid electro-oxidation reaction. The obtained mass specific activity for Pd/rGO 1 -C 1 (969.76 mA mg −1 ) is 1.52 times higher than for Pd/rGO (639.5 mA mg −1 ) and 2.63 times higher than Pd/C (368.73 mA mg −1 ) synthesized under the same conditions and at given onset peak potentials. The Pd/rGO 1 -C 1 electrocatalyst was also found to be much more stable than other catalysts as evidenced by chronoamperometric measurements for up to 3000 s. The high activity and stability of the catalyst fabricated over the composite carbon support is due to a synergism between the Pd metal and the composite support toward charge transfer, where highly porous carbon provides a high surface area and the rGO is highly conductive, thereby boosting the electrical properties of the catalyst.
Majeed, I, Nadeem, MA, Badshah, A, Kanodarwala, FK, Ali, H, Khan, MA, Stride, JA & Nadeem, MA 2017, 'Titania supported MOF-199 derived Cu-Cu2O nanoparticles: highly efficient non-noble metal photocatalysts for hydrogen production from alcohol-water mixtures', CATALYSIS SCIENCE & TECHNOLOGY, vol. 7, no. 3, pp. 677-686.View/Download from: Publisher's site
Majeed, I, Nadeem, MA, Kanodarwala, FK, Hussain, E, Badshah, A, Hussain, I, Stride, JA & Nadeem, MA 2017, 'Controlled Synthesis of TiO2Nanostructures: Exceptional Hydrogen Production in Alcohol-Water Mixtures over Cu(OH)2–Ni(OH)2/TiO2Nanorods', ChemistrySelect, vol. 2, no. 25, pp. 7497-7507.View/Download from: Publisher's site
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Development of non-noble metal photocatalysts for hydrogen (H 2 ) generation from renewables is important towards cost effective technology. Titania nanorods with different phase compositions and surface areas were fabricated by calcination of hydrogen titanate (H 2 Ti 3 O 7 ) precursors obtained by treating P25 (TiO 2 ) hydrothermally in 10 M NaOH and followed by HCl washing. Subsequently the copper and nickel hydroxides were co-deposited over TiO 2 nanorods and used to generate H 2 from alcohol-water mixtures under UV light. Among the synthesized materials, the optimized photocatalyst 0.8Cu(OH) 2 -0.2Ni(OH) 2 /TNR 130 -400 showed very high H 2 production rates that are 26.6 mmol h −1 g −1 in 20 vol.% ethanol-water mixture and 35.1 mmol h −1 g −1 in 5 vol.% glycerol-water mixtures. The amount of this H 2 production is even higher than obtained from noble metal supported TiO 2 photocatalysts. This exceptional photocatalytic H 2 production is attributed to the high synergism among nanords mophology of support and in situ formation of Cu and Ni exclusively in metallic states during photoreactions.
Ali, H, Kanodarwala, FK, Majeed, I, Stride, JA & Nadeem, MA 2016, 'La2O3 Promoted Pd/rGO Electro-catalysts for Formic Acid Oxidation', ACS APPLIED MATERIALS & INTERFACES, vol. 8, no. 47, pp. 32581-32590.View/Download from: Publisher's site
Goncalves, LFFF, Silva, CJR, Kanodarwala, FK, Stride, JA & Pereira, MR 2015, 'Effect of acid or alkaline catalyst and of different capping agents on the optical properties of CdS nanoparticles incorporated within a diureasil hybrid matrix', OPTICAL MATERIALS, vol. 49, pp. 171-181.View/Download from: Publisher's site
Kanodarwala, FK, Wang, F, Reece, PJ & Stride, JA 2015, 'Phase transformations in CdSe quantum dots induced by reaction time', MATERIALS LETTERS, vol. 141, pp. 67-69.View/Download from: Publisher's site
Goncalves, LFFF, Kanodarwala, FK, Stride, JA, Silva, CJR, Pereira, MR & Gomes, MJM 2014, 'One-pot synthesis of CdSe nanoparticles exhibiting quantum size effect within a sol-gel derived ureasilicate matrix', JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, vol. 285, pp. 21-29.View/Download from: Publisher's site
Goncalves, LFFF, Silva, CJR, Kanodarwala, FK, Stride, JA & Gomes, MJM 2014, 'Synthesis and characterization of organic-inorganic hybrid materials prepared by sol-gel and containing CdS nanoparticles prepared by a colloidal method using poly(N-vinyl-2-pyrrolidone)', JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, vol. 71, no. 1, pp. 69-78.View/Download from: Publisher's site
Goncalves, LFFF, Silva, CJR, Kanodarwala, FK, Stride, JA, Pereira, MR & Gomes, MJM 2014, 'Influence of Cd2+/S2- molar ratio and of different capping environments in the optical properties of CdS nanoparticles incorporated within a hybrid diureasil matrix', APPLIED SURFACE SCIENCE, vol. 314, pp. 877-887.View/Download from: Publisher's site
Goncalves, LFFF, Silva, CJR, Kanodarwala, FK, Stride, JA, Pereira, MR & Gomes, MJM 2014, 'Synthesis of an optically clear, flexible and stable hybrid ureasilicate matrix doped with CdSe nanoparticles produced by reverse micelles', MATERIALS CHEMISTRY AND PHYSICS, vol. 147, no. 1-2, pp. 86-94.View/Download from: Publisher's site
Goncalves, LFFF, Kanodarwala, FK, Stride, JA, Silva, CJR & Gomes, MJM 2013, 'One-pot synthesis of CdS nanoparticles exhibiting quantum size effect prepared within a sol-gel derived ureasilicate matrix', OPTICAL MATERIALS, vol. 36, no. 2, pp. 186-190.View/Download from: Publisher's site
Goncalves, LFFF, Silva, CJR, Kanodarwala, FK, Stride, JA, Pereira, MR & Gomes, MJM 2013, 'Synthesis and characterization of organic-inorganic hybrid materials prepared by sol-gel and containing ZnxCd1-xS nanoparticles prepared by a colloidal method', JOURNAL OF LUMINESCENCE, vol. 144, pp. 203-211.View/Download from: Publisher's site
Kanodarwala, FK & Stride, JA 2016, 'Phase transition in CdSe quantum dots and deposition of cdse quantum dots on graphene sheets' in Nanomaterials: Science and Applications, pp. 203-230.View/Download from: Publisher's site
© 2016 Pan Stanford Publishing Pte. Ltd. To date, quantum dots (QDs) have been synthesized through a number of different processes ranging from colloidal synthesis and electrochemical methods to chemical vapor deposition (CVD). This chapter focuses on the synthesis of high-quality CdSe nanocrystals through a bench-top colloidal synthesis, paying particular attention to the effects on the size and crystallinity of the QDs of varying the reaction temperature and reagent concentrations. Powder X-ray diffraction (PXRD) analysis and high-resolution transmission electron microscopy (HRTEM) have been used to highlight a transition of the crystallite phases obtained, from cubic zinc blende to hexagonal wurtzite and back again to the cubic phase as a function of reaction time. The nature of this phase shift is believed to be due to the rapid growth along the (111) crystallite facets, with the facial facets then "catching up," to restore the cubic symmetry. High-quality trioctylphosphine/trioctylphosphine oxide (TOP/ TOPO)-capped CdSe QDs displaying a narrow emission band were then grafted onto graphene nanosheets through a simple wetchemical procedure. A significant red shift of both the broad absorption and the narrow emission spectrum of the QDs was observed upon attachment to graphene, as determined by UV-Vis absorption and photoluminescence spectroscopies, whilst HRTEM data clearly show the successful decoration of the graphene sheets with CdSe QDs. This type of nanocomposite may have potential applications in the fields of optics, biological imaging, and sensing.