We report on the analysis of nonlinear current–voltage characteristics exhibited by a set blocking metal/SnO2/metal. Schottky barrier heights in both interfaces were independently extracted and their dependence metal work function was analyzed. The disorder-induced interface states effectively pinned Fermi level at SnO2 surface, leading to observed barriers. model is useful for any two-terminal device which cannot be described conventional diode configuration.

Charge transport and shelf-degradation of MEH-PPV thin-films were investigated through stationary (e.g. current versus voltage — JxV) transient Time-of-Flight ToF, Dark-Injection Space-Charge-Limited Current DI-SCLC, Extraction by Linearly Increasing Voltage CELIV) techniques. carrier mobility in nanometric films was best characterized JxV DI-SCLC. It approaches 10− 6 cm2/Vs under a SCLC regime with deep traps for light-emitting diode applications. ToF measurements performed on micrometric...

The current–voltage (I–V) characteristics of metal–semiconductor junction (Au–Ni/SnO2/Au–Ni) Schottky barrier in SnO2 nanowires were investigated over a wide temperature range. By using the Schottky–Mott model, zero bias height Φ B was estimated from I–V characteristics, and it found to increase with increasing temperature; on other hand ideality factor (n) decrease temperature. variation n attributed spatial inhomogeneity height. experimental exhibited Gaussian distribution having mean...

Transparent Conductive Oxides (TCOs) have been widely used as sensors for various hazardous gases. Among the most studied TCOs is SnO2, due to tin being an abundant material in nature, and therefore accessible moldable-like nanobelts. Sensors based on SnO2 nanobelts are generally quantified according interaction of atmosphere with its surface, changing conductance. The present study reports fabrication a nanobelt-based gas sensor, which electrical contacts self-assembled, thus do not need...

Persistent photoconductivity (PPC) in vanadyl phthalocyanine (VOPc) organic light-emitting diodes was investigated using photoconductive time response, photocurrent–voltage characteristics and charge extraction linearly increasing voltage (CELIV) measurements. The experiments were performed phase 1 (amorphous) 2 (crystalline) samples obtained by the physical vapour deposition (PVD) technique over ITO/glass electrodes with an Al covering electrode. results indicated a long decay VOPc...

Fluorine doped SnO2 (FTO) nanobelts were synthesized and their transport properties, such as conduction mechanism, mobility, carrier density of states (DOS) investigated. Variable range hopping was observed the dominant mechanism in a large temperature (40–260 K). Through these data we estimated localization length distance at 300 K FTO exhibiting three-dimensional character for transport. The mobility calculated to be 48 cm2 V−1 s−1 samples with 2 × 1018 cm−3. Taking into account parameters...

Cyclodextrin (CD) is a conical compound used in food and pharmaceutical industry to complexation of hydrophobic substances. It product microbial enzymes which converts starch into CD during their activity. We aim detect using active-electrode biosensor SnO2. They were grown on active electrode by the VLS method. The consists several glucose units have hydroxyl groups tend bind interface states present nanowires changing conductivity. Experimental results electrical conductivity at different...

Industrial fermentation generates products through microbial growth associated with the consumption of substrates. The efficiency industrial production high commercial value such as ethanol from glucose (GLU) is dependent on bacterial contamination. Controlling sugar conversion into well sterility process are objectives to be considered here by studying GLU and ultraviolet light (UV) sensors. In this work, we present two different approaches SnO2 nanowires grown Vapor–Liquid–Solid (VLS)...

This review provides relevant advances in detecting fungal aflatoxins from agro-industrial products during their development, storage, and processing. For real-time monitoring of these toxins, methodologies were modified adapted over time. The description the current literature evolution detection quantification aflatoxin agro-products contaminated by fungi is carried out with description, mainly chromatographic, immunochemical, spectroscopic, genomic methods. In addition to equipment,...

Acetone is a toxic gas employed in several pharmaceutical and commercial preparations, circumstances that demand efficient exposure control methods. Quasi one-dimensional SnO 2 (n-type) remarkable material for such purpose. In this work, we discuss the characteristics of an sensor built metal-semiconductor-metal (MSM) architecture, using nanowire network as activity layer. The crystallographic information was confirmed XRD found out to be monocrystalline rutile structure. SEM images desired...

Articulate the most diverse and sophisticated technologies, such as Remote Sensing, Big Data, Cloud Computing, Internet of Things, 3D Printing, among others, is part universe 4.0, whether industrial or agricultural. Focusing on agricultural context, this paper proposes a low-cost 4.0 device to perform monitoring control certain environmental variables for detection aflatoxins in peanut crops. Aflatoxins are toxic metabolite fungi genus Aspergillus that can cause carcinogenic effects humans...

When present in specific amounts the air, colorless, odorless, and tasteless gases monoxide carbon dioxide may either replace oxygen red blood cells (CO) or increase respiratory rate causing cardiac arrhythmias (CO2), leading to death. Commercial sensors take around 8 h detect levels of CO (50 PPM), moderate poisoning. SnO2 presents controlled interactions with atmosphere using conductance vacancy adjustments capture electrical properties. However, selectivity gas detection by can still be...

Desde 2018, o aprofundamento teórico da componente de física – na área Ciências Natureza e suas Tecnologias subdivide-se nas seguintes unidades temáticas conhecimento: matéria energia; vida, Terra cosmos; tecnologia linguagem científica. Neste contexto, ensino deve ter como um dos seus pilares, sociedade contemporânea, a busca por explicações respeito das novas tecnologias integradas à profissão ao cotidiano do estudante, tendo suporte indissociabilidade entre teoria prática no processo...

In recent years the number of fires is increasing, both in Brazil and world. One most efficient ways to fight related prevention through monitoring data prediction, emphasizing application sensors use orbital satellites capture images areas fires. Time a crucial factor fighting Monitoring via satellite, for example, may have delay 10 minutes two days—this from check set low-quality due adverse weather conditions visibility. This work's objective development hybrid model: (i) device measuring...