Integrated miniature fluorescent probe to leverage the sensing potential of ZnO quantum dots for the detection of copper (II) ions

Ng, Sing Muk; Wong, Derrick Sing Nguong; Phung, Jane Hui Chiun; Chua, Hong Siang

doi:10.1016/j.talanta.2013.07.031

Cited by 37 publications

(21 citation statements)

References 30 publications

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“…However, ZnO is an effective alternative, due to its comparative band gap energy and lower cost of fabrication [96,97]. In addition, ZnO is considered higher photoactive than TiO 2 as reported by several scientists [98][99][100][101]. The higher photoactivity is referred to the higher efficiency to provoke the formation of photoexcited charge carriers [96,102].…”

Section: Photocatalytic Propertiesmentioning

confidence: 99%

Pure, Size Tunable ZnO Nanocrystals Assembled into Large Area PMMA Layer as Efficient Catalyst

et al. 2019

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Here, we demonstrate for the first time a strategy to self-assemble ZnO nanoparticles (NP) on a large area by a facile one-step process. First, rough and random ZnO nanocrystals (NC), were produced by free-stabilizing aqueous synthesis. Therefore, a post thermal treatment at various temperatures ranging from 80 to 800 °C was necessary to obtain size-tunable and photoluminescent crystalline NP. The fabricated NP had both efficient UV photoluminescence and photocatalytic activity by photo-degradation of Methylene Blue (MB) dye. The annealed NP showed an absorption blue shift in the UV region with decreasing size. This shift was attributed to high quantum confinement effect since ZnO NP diameter reached values lower than the Bohr radius of ZnO (~2.7 nm). The photocatalytic activity displayed dependency on the particle’s size, number, and crystallinity. Subsequently, the NP were self-assembled inside poly(methyl methacrylate) (PMMA) nanoholes. Subsequently, large area substrate of homogenous properties ZnO NP was obtained. Moreover, the synthesis facility, photoemission and photocatalytic properties of ZnO NP could be a new insight into the realization of high performance and low cost UV laser devices.

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Section: Photocatalytic Propertiesmentioning

confidence: 99%

Pure, Size Tunable ZnO Nanocrystals Assembled into Large Area PMMA Layer as Efficient Catalyst

et al. 2019

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“…Ng et al . [55] found this novel, turn-off luminescent assay for Cu 2+ ions had highly repeatable and reliable performances, and the limit of detection (LOD) was measured to be 7.68 × 10 − 7 M.…”

Section: Luminescence Sensors Based On Zno Npsmentioning

confidence: 99%

Photoluminescent ZnO Nanoparticles and Their Biological Applications

2015

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During the past decades, numerous achievements concerning luminescent zinc oxide nanoparticles (ZnO NPs) have been reported due to their improved luminescence and good biocompatibility. The photoluminescence of ZnO NPs usually contains two parts, the exciton-related ultraviolet (UV) emission and the defect-related visible emission. With respect to the visible emission, many routes have been developed to synthesize and functionalize ZnO NPs for the applications in detecting metal ions and biomolecules, biological fluorescence imaging, nonlinear multiphoton imaging, and fluorescence lifetime imaging. As the biological applications of ZnO NPs develop rapidly, the toxicity of ZnO NPs has attracted more and more attention because ZnO can produce the reactive oxygen species (ROS) and release Zn2+ ions. Just as a coin has two sides, both the drug delivery and the antibacterial effects of ZnO NPs become attractive at the same time. Hence, in this review, we will focus on the progress in the synthetic methods, luminescent properties, and biological applications of ZnO NPs.

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“…Recent work has shown Arduino platforms integrated into optical sensing systems, for instance for Copper (II) ions [4] and Volatile Organic Compounds in seawater [5]. Another advantage to these platforms is that the device can be flashed with firmware allowing the device to function without the need for external control software from e.g.…”

Section: Introductionmentioning

confidence: 99%

A low-cost, portable optical explosive-vapour sensor

Gillanders

Samuel

Turnbull

2017

Sensors and Actuators B: Chemical

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Highlights Arduino-based optical instrument for explosives detection designed and prototyped  Few-ppb detection of 2,4-DNT achieved under laboratory conditions with simple photodiode circuitry and off-the-shelf microprocessor  Simulated buried landmines successfully detected Abstract Humanitarian demining requires a broad range of methodologies and instrumentation for reliable identification of landmines, antipersonnel mines, and other explosive remnants of war (ERWs). Optical sensing methods are ideal for this purpose due to advantages in sensitivity, time-of-response and small form factor. In this work we present a portable photoluminescence-based sensor for nitroaromatic vapours based on the conjugated polymer Super Yellow integrated into an instrument 2 comprising an excitation LED, photodiode, Arduino microprocessor and pumping mechanics for vapour delivery. The instrument was shown to be sensitive to few-ppb concentrations of explosive vapours under laboratory conditions, and responds to simulated buried landmine vapour. The results indicate that a lightweight, easy-to-operate, low-cost and highly-sensitive optical sensor can be readily constructed for landmine and ERW detection in the field, with potential to aid worldwide efforts in landmine mitigation.

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Integrated miniature fluorescent probe to leverage the sensing potential of ZnO quantum dots for the detection of copper (II) ions

Cited by 37 publications

References 30 publications

Pure, Size Tunable ZnO Nanocrystals Assembled into Large Area PMMA Layer as Efficient Catalyst

Pure, Size Tunable ZnO Nanocrystals Assembled into Large Area PMMA Layer as Efficient Catalyst

Photoluminescent ZnO Nanoparticles and Their Biological Applications

A low-cost, portable optical explosive-vapour sensor

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