A Self-doping Surface Effect and its Influence on the Sensor Performance of Undoped SnO2 Based Gas Sensors

Rebholz, Julia; Dee, Carolin; Bârsan, Nicolae

doi:10.1016/j.proeng.2015.08.571

Cited by 21 publications

(19 citation statements)

References 9 publications

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“…Afterwards, the product was divided into two samples, one calcined at 450 °C (SnO2-450) and the other at 1000 °C (SnO2-1000) for 8 h under air leading to surface areas of 32.7 and 3.6 m 2 g -1 , respectively. Spectroscopic investigations by DRIFTS [34,35] and UV/vis-DRS [36] and electronic studies of the conduction mechanisms [37,38] for two base materials are reported elsewhere. The spectroscopic investigations reveal strong difference in the surface chemistry and optical band gap, while the electronic studies exhibit the same conduction mechanism for both materials, namely a depletion layer-controlled conduction involving grains with an unaffected bulk region.…”

Section: Sno2 Synthesismentioning

confidence: 99%

Microfluidically synthesized Au, Pd and AuPd nanoparticles supported on SnO2 for gas sensing applications

Tofighi

Degler

Junker

et al. 2019

Sensors and Actuators B: Chemical

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Monometallic Au and Pd nanoparticles (NPs) and homogeneous AuPd nanoalloy particles were synthesized in a continuous flow of reactants (HAuCl4, K2PdCl4, NaBH4 and polyvinylpyrrolidone (PVP)) using a microfluidic reactor with efficient micromixers. The obtained ultrasmall NPs were subsequently deposited onto SnO2 supports with different surface area (32.7 and 3.6 m 2 g-1). Samples with 1.0 and 0.1 wt.% metal loading were prepared. After calcination at 380 °C for 1 h the supported NPs aggregated to some extent. SnO2 supported AuPd nanoalloys with low (0.1 wt.%) metal loadings showed the smallest NP diameters (~ 5-7 nm) and the narrowest size distribution among the samples. The gas sensing performance of the materials was investigated at 300 °C in four different gas atmospheres containing either CO, CH4, ethanol or toluene using dry and humid conditions. They exhibited a distinct variation in the response patterns and selectivity toward the test gases depending on composition and metal loading: Au increased the sensor signals compared to pristine SnO2 in all cases and decreased the interference of water vapor; the supported Pd NPs showed a weak response to toluene, strong sensitivity in CO sensing and slightly better response in ethanol sensing in humid air compared to dry air. However, they showed a high selectivity toward CH4 when used in dry air; AuPd alloy particles provided lower sensor signals compared to pristine SnO2 and no remarkable CH4 selectivity, in contrast to the Pd system. Operando diffuse reflectance infrared Fourier-transformed spectroscopy (DRIFTS) indicates a strong band bending in the case of Pd and AuPd NPs, whereas in the case of Au no band bending occured, indicating a strong electronic interaction between the support and Pd-containing NPs (Fermi-level control mechanism), and a weak electronic interaction between SnO2 and Au NPs (spill-over mechanism).

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Section: Sno2 Synthesismentioning

confidence: 99%

Microfluidically synthesized Au, Pd and AuPd nanoparticles supported on SnO2 for gas sensing applications

Tofighi

Degler

Junker

et al. 2019

Sensors and Actuators B: Chemical

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“… 19 Recently, tin oxide has received widespread attention in the field of pharmaceutical research as a result of its application in monitoring the drug release by fluorescent signal. 20 Tin oxide is an n-type semiconductor with chemical stability, high specific surface area and good biocompatibility, has optical properties in the visible spectral range and is extensively used in the fields of transparent conductors, 21 gas sensors, 22 biosensors, 23 catalysis, 24 energy storage 25 and medicinal applications. 26 , 27 However, so far, there have been no previous reports of the oral administration of mesoporous tin oxide-based formulations.…”

Section: Introductionmentioning

confidence: 99%

Development of a tin oxide carrier with mesoporous structure for improving the dissolution rate and oral relative bioavailability of fenofibrate

Bai

et al. 2018

DDDT

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BackgroundBiopharmaceutics classification system class II drugs have low solubility, which limits their extent and speed of absorption after oral administration. Over the years, mesoporous materials have been widely used to increase the dissolution rate and oral relative bioavailability of poorly water-soluble drugs.ObjectivesIn order to improve the dissolution rate and increase oral relative bioavailability of the poorly water-soluble drugs, a tin oxide carrier (MSn) with a mesoporous structure was successfully synthesized.MethodsIn this study, MSn was synthesized using mesoporous silica material (SBA-15) as the template. Fenofibrate (FNB) was adsorbed into the channels of MSn by an adsorption method. Characterizations of the pure FNB, MSn, physical mixture of the drug and MSn (PM; 1:1) and FNB-loaded MSn (FNB-MSn) samples were carried out by the scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption/desorption, powder X-ray diffractometer (PXRD), differential scanning calorimetry (DSC) and Fourier transform infrared (FT-IR) spectroscopy. Cytotoxicity assay (MTT) was used to evaluate the cytotoxicity of MSn. In vitro dissolution studies were performed to investigate the dissolution rate of FNB-MSn. In vivo pharmacokinetic studies were used to investigate the changes of plasma drug concentrations of FNB-MSn tablets and commercial FNB tablets in rabbits.ResultsDetailed characterization showed that FNB in the channels of MSn was present in an amorphous state. The in vitro release tests demonstrated that MSn with a good biocompatibility could effectively enhance the dissolution rate of FNB. Pharmacokinetic results indicated that MSn significantly increased the oral relative bioavailability of FNB.ConclusionMSn can be regarded as a promising carrier for an oral drug delivery system.

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“…SnO2 is a semiconductor material with an energy band gap of about 3.6 eV and is sensitive to the presence of gas (Susilawati, et al, 2020). Based on these properties, SnO2 is widely applied to gas sensors (Rebholz, et al, 2015), optoelectronic equipment (Ikraman, et al, 2017), solar cells (Bittau, et al, 2017), capacitors , liquid crystal displays (Andrade, et al, 2019), diode (Gullu, et al, 2020), and transistor (Liu, et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of SnO2 Thin Film Semiconductor for Electronic Device Applications

Doyan

Susilawati

Alam

et al. 2021

jppipa, pendidikan ipa, fisika, biologi, kimia

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Synthesis and characterization of SnO2 thin films with various types of doping materials such as aluminum, fluorine and indium have been successfully carried out. This study aims to determine the effect of various types of doping materials on the quality of thin films such as the energy band gap produced. The results showed that the higher the doping concentration, the more transparent the layer formed. In addition, the optical properties of thin films such as band gap energy are affected by the applied doping. The direct and indirect values of the largest band gap energy for the percentage of 95:5% are 3.62 eV and 3.92 eV are found in the SnO2: In thin layer. Meanwhile, the lowest direct and indirect values of band gap energy are in the thin layer of SnO2:(Al+F+In) for a percentage of 85:15%, namely 3.41 eV and 3.55 eV. The greater the amount of doping given, the smaller the bandgap energy produced. In addition, the more combinations of doping mixtures (aluminum, fluorine, and indium) given, the smaller the bandgap energy produced. This shows that the quality of a thin film of SnO2 produced is influenced by the amount of concentration and the type of doping used

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A Self-doping Surface Effect and its Influence on the Sensor Performance of Undoped SnO2 Based Gas Sensors

Cited by 21 publications

References 9 publications

Microfluidically synthesized Au, Pd and AuPd nanoparticles supported on SnO2 for gas sensing applications

Microfluidically synthesized Au, Pd and AuPd nanoparticles supported on SnO2 for gas sensing applications

Development of a tin oxide carrier with mesoporous structure for improving the dissolution rate and oral relative bioavailability of fenofibrate

Synthesis and Characterization of SnO2 Thin Film Semiconductor for Electronic Device Applications

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