Browsing by Author "Bîrnaz, Adrian"

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    DETECTAREA LUMINII UV PE BAZA REȚELELOR DE ZnO
    (CEP USM, 2024) Nagpal, Rajat; Lupan, Cristian; Sandu, Iulia; Bîrnaz, Adrian
    ZnO network is considered as a good visible blind UV light detector. In this study we report room temperature UV detection analysis at three different wavelengths spread in UV-A and UV-B regions. Studied ZnO network is prepared by one of the most efficient methods: flame transport synthesis. ZnO network between two interdigitated electrodes were irradiated by UV radiation of three different wavelengths as 400nm, 370nm, and 280nm. The result analysis exhibits UV response of ~ 32, 28, and 11 at wavelength 370nm, 280nm, and 400nm, respectively. The UV response characteristics were measured and get analysed in detail with its sensing mechanism, correlating slow regeneration or decay time (~7.9s) to slow exchange of carrier’s movement due to trapping of carriers by oxygen ions. The detailed sensing mechanism has been discussed.
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    Portable electronic nodes for a sensor network [Articol]
    (Editura USM, 2024) Maslova, Tatiana; Bîrnaz, Adrian; Lupan, Oleg
    To capitalize on the research on metal oxide-based sensors that is being intensively studied by our research team, there is a need to connect these sensors into devices capable of receiving, storing and, if necessary, transmitting measured data. We are also investigating the mechanics of sensor detection using chemistry and applied physics. To achieve this goal, there are some impediments that must be overcome, such as the method of data acquisition, the power consumed by the device, the stability over time with a subsequent correction, the distance to which measured data will be transmitted and others. Another aspect is the size and portability of these devices with built-in sensors. This paper presents some concepts that provide solutions to the problems presented. These devices are important for monitoring environmental parameters with application in agriculture, cellars, production halls. Another possible use is to incorporate them into drones, which will potentially increase their mobility and detection range.