Annealing Effects on SnO2 Thin Film for H2 Gas Sensing

Mehmet

Gazi University Journal of Science Part A: Engineering and Innovation

2023

The triboelectric nanogenerator is a state-of-the-art device for addressing the growing problem of meeting the world's ever-increasing energy needs by converting mechanical energy into electrical energy. Using the popular semiconductor SnO2 nanostructured thin films as a triboelectric layer over contact regions, as opposed to polymers with lesser performance, increases the output power and life time of nanogenerators. In order to design a triboelectric nanogenerator, deposited thin film SnO2 is used as a friction layer with Ag electrode after heat-treatment at 623 K with a contrary layer of PMMA poly (methyl-methacrylate) with ITO electrode. The structural and electrical properties were analyzed by using scanning electron microscopy (SEM), electro-impedance spectroscopy (EIS) and atomic force microscopy (AFM) measurements. The increased output power of the triboelectric nanogenerator is attributed to the nanoscale PMMA contact charge created by tunneling electrons in the SnO2/Ag nanocomposite thin film layer. Due to its proximity to the PMMA/ITO surface, the SnO2/Ag layer causes electron field emission, and tapping the SnO2/Ag layer may result in electron cloud overlap. Similar to a semiconductor/insulator interface, the Fermi level of SnO2 plays a crucial role in electron transport. The system efficiency stated as a touch detector in a conventional keyboard that generates its own power is revealed in part by an analysis of its operating state up to the 4V.

Section: Figure 2 Sem Micrographs Of A) Untreated and B) 673 K Thin F...supporting

confidence: 92%

Self-Powered Mechanical Energy Sensor Application of SnO2/Ag and PMMA/ITO Nanocomposites via Triboelectric Effect

Mehmet

Gazi University Journal of Science Part A: Engineering and Innovation

2023

“…2). 23) VO 2 is relatively stable at higher temperatures and lower pressure than V 2 O 5 . Conversely, V 2 O 5 is stable at lower temperatures and higher pressure.…”

Section: Resultsmentioning

confidence: 89%

Annealing temperature effect on the temperature coefficient of resistance for vanadium oxide (VOx) thin films as bolometer materials

Lee

Kim

Jung

et al. 2023

Jpn. J. Appl. Phys.

Self Cite

Vanadium oxides (VOx) are representative materials with a high temperature coefficient of resistance (TCR); however, VOx films can have complex phase structures that are dependent on their fabrication method. While past research has focused on the TCR behavior of VOx thin films, this study investigates the TCR of VOx thin films annealed at different temperatures as well as focuses on the relation between the VOx phase, surface morphology, sheet resistance, and TCR. VOx thin films were deposited via radio-frequency magnetron sputtering and annealed at 150°C–500°C in 20% O2. Alongside morphological changes, the deposited VOx thin films exhibited phase changes from V2O5 to VO2 with increasing annealing temperature. The VOx thin films annealed at 300°C and 330°C showed the lowest and highest average TCR of 1.25%/°C and 3.34%/°C, respectively. Furthermore, a bolometer fabricated using the higher-TCR film showed more than 5-fold infrared responsivity under the same infrared intensity.

“…However, bare SnO 2 materials show relatively low selectivity and sensitivity toward H 2 . [17][18][19] Moreover, this kind of sensors usually need to be operated at high temperature, which is unsuitable for detecting flammable H 2 from the considerations of energy saving and safety. Fortunately, noble metals (e.g., Pd, Pt, Au) acted as catalyst can improve the sensing performance of SnO 2 -based materials.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive and Wide‐Range Flexible Hydrogen Sensor Based on Pd Nanoparticles Decorated Ultrathin SnO₂ Film

Ren

Zhang

Chen

et al. 2023

Adv Elect Materials

Highly sensitive and reliable hydrogen detection is prerequisite for the large‐scale implementation of green energy hydrogen. It remains a tough challenge to get a highly selective H2 sensor to low concentration H2 gas with low working temperature. In this work, high performance flexible hydrogen sensor using ultrathin SnO2 film decorated by Pd nanoparticles (NPs) on polyimide (PI) was developed based on versatile atomic layer deposition (ALD) and cluster beam deposition (CBD). The influence of Pd NPs loading amount and operating temperature on the performance of hydrogen sensors was studied. The sensors obtain an extremely high response over 20000 to 30 ppm H2 at the relatively low operating temperature of 75–125 °C. The Pd NPs@SnO2/PI sensor achieves a wide detection range of 0.1‐5000 ppm with the limit of detection (LOD) of 100 ppb at 125 °C. A low LOD of 250 ppb can still be achieved at room temperature. The sensors also exhibit outstanding sensing selectivity for hydrogen over interfering gases and excellent mechanical resistance after 2000 bending cycles. The mechanism for improved sensing performance of ALD ultrathin film with CBD‐derived noble metal NPs decoration may be a feasible strategy for the construction of highly sensitive, selective, and flexible hydrogen sensors.