Influence of annealing time on random lasing from ZnO nanorods

Nordin, Mohd Nawawi Mohd; Halim, Mohd Mahadi; Hashim, M.R.; Shakfa, Mohammad Khaled; Maryam, W.

doi:10.1016/j.rinp.2020.102955

Cited by 13 publications

(5 citation statements)

References 29 publications

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“…In this work, we varied the annealing duration t An to obtain slightly different nanorod dimensions. Consistent with that reported elsewhere 43 , the mean length L rod and diameter ϕ rod of the hexagonally shaped ZnO nanorods can be seen from Fig. 2a, b to increase by approximately 75% and 83%, respectively, from L rod = 1.6 ± 0.2 μ m and ϕ rod = 60 ± 20 nm to L rod = 2.8 ± 0.2 μ m and ϕ rod = 110 ± 50 nm when t An was extended from 1–3 h. Additionally, we also observed that the nanorods were more densely packed with longer annealing times.…”

Section: Resultssupporting

confidence: 93%

“…The ceramic holder was then placed in the middle of a high-temperature tube furnace (RHTC 80-710; Nabertherm Inc., Bahnhofstr, Lilienthal, Germany) heated to 400 ∘ C over 30 min and annealed for 3 h to obtain a stable film with crystallization centres 49 . We note that longer annealing times can result in an increase in nanorod diameters 43 .…”

Section: Methodsmentioning

confidence: 76%

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Nanoscale plasma-activated aerosol generation for in situ surface pathogen disinfection

et al. 2022

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Plasma treatment constitutes an efficient method for chemical-free disinfection. A spray-based system for dispensing plasma-activated aerosols onto surfaces would facilitate disinfection of complex and/or hidden surfaces inaccessible to direct line-of-sight (for example, UV) methods. The complexity and size of current plasma generators (for example, plasma jet and cometary plasma systems)—which prohibit portable operation, together with the short plasma lifetimes, necessitate a miniaturized in situ technique in which a source can be simultaneously activated and administered on-demand onto surfaces. Here, we demonstrate this possibility by combining two nanoscale technologies for plasma and aerosol generation into an integrated device that is sufficiently small and lightweight. Plasma is generated on a carpet of zinc oxide nanorods comprising a nanoneedle ensemble, which when raised to a high electric potential, constitutes a massive point charge array with near-singular electric fields to effect atmospheric breakdown. The plasma is then used to activate water transported through an underlying capillary wick, that is subsequently aerosolized under MHz-order surface acoustic waves. We show that the system, besides being amenable to miniaturization and hence integration into a chipscale device, leads to a considerable improvement in plasma-activation over its macroscale cometary discharge predecessor, with up to 20% and 127% higher hydrogen peroxide and nitrite ion concentrations that are respectively generated in the plasma-activated aerosols. This, in turn, leads to a 67% reduction in the disinfection time to achieve 95% bacterial load reduction, therefore demonstrating the potential of the technology as an efficient portable platform for on-demand field-use surface disinfection.

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Section: Resultssupporting

confidence: 93%

Section: Methodsmentioning

confidence: 76%

Nanoscale plasma-activated aerosol generation for in situ surface pathogen disinfection

et al. 2022

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“…It is possible that scattering may be affected with increasing doping. Similarly, grain boundaries have been shown to affect random lasing emission [44] as such lasing from polycrystalline ZnO nanorods prepared by the same method (i.e. CBD) has also shown to increase threshold [45].…”

Section: Resultsmentioning

confidence: 99%

“…It is possible that scattering may be affected with increasing doping. Similarly, grain boundaries have been shown to affect random lasing emission[44] as…”

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confidence: 99%

Random lasing behaviour in Al-doped ZnO nanorods

et al. 2023

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“…The current state of laser-based optical biosensors has mostly evolved around the use of laser dyes as a gain medium. − Such dye-based sensors typically result in a broad lasing spectrum (10 to 30 nm line widthwhich is comparable to fluorescence-based sensors) and are subject to degradation of the laser dye. As such, solid-state gain medium for random lasers has been extensively investigated by researchers to replace the need for laser dyes to achieve lasing. − Certain types of random lasers employing a solid-state gain medium with high scattering provided by the gain medium itself and have been shown to provide a narrow emission line. − Hence, degradation issues could be addressed by employing a solid-state gain medium with current laser-based biosensors. A review of random laser-based biosensors is provided in detail in the section Random Laser Biosensors.…”

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confidence: 99%

Review of Open Cavity Random Lasers as Laser-Based Sensors

et al. 2022

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In this review, the concept of open cavity lasing for ultrasensitive sensing is explored, specifically in driving important innovations as laser-based biosensorsa field mostly dominated by fluorescence-based sensing. Laser-based sensing exhibits higher signal amplification and lower signal-to-noise ratio due to narrow emission lines as well as high sensitivity due to nonlinear components. The versatility of open cavity random lasers for probing analytes directly which is ultrasensitive to small changes in chemical composition and temperature fluctuations paves the path of utilizing narrow emission lines for advanced sensing. The concept of random lasing is first explained followed by a comparison of the different lasing threshold that has been reported. This is followed by a survey of reports on laser-based sensing and more specifically as biosensors. Finally, a perspective on the way forward for open cavity laser-based sensing is put forth.

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Influence of annealing time on random lasing from ZnO nanorods

Cited by 13 publications

References 29 publications

Nanoscale plasma-activated aerosol generation for in situ surface pathogen disinfection

Nanoscale plasma-activated aerosol generation for in situ surface pathogen disinfection

Random lasing behaviour in Al-doped ZnO nanorods

Review of Open Cavity Random Lasers as Laser-Based Sensors

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