Nanoscale SnO₂ Hollow Spheres and Their Application as a Gas-Sensing Material

Abstract

The use of nanoscale SnO2 hollow spheres as a redox-active sensor is investigated. The underlying hollow spheres are prepared via a microemulsion approach and exhibit an outer diameter of about 15−25 nm, a highly crystalline shell with a thickness of 3−5 nm and an inner cavity of 10−20 nm in diameter. Subsequent to materials characterization based on SEM, STEM, TEM, IR, TG, BET, and XRD the applicability of as-prepared hollow spheres as highly porous layers in sensor operation is tested. Accordingly, SnO2 hollow spheres deposited on common sensor substrates show a good response to CO in a concentration range of 50 to 300 ppm. Moreover, the material turned out to be useful as a model system to study the conduction model of a porous layer with small grains.

Synthesis of Polyvinylpyrrolidone-Stabilized Nonstoichiometric SnO2 Nanosheets with Exposed {101} Facets and Sn(II) Self-Doping as Anode Materials for Li-Ion Batteries

“…Tin dioxide (SnO 2 ) is an important n-type semiconducting metal oxide with coexistence of conductivity and transparency owing to its natural nonstiochiometry such as tin interstitial and oxygen vacancies, [1] which has been widely used in transparent conducting films, [2,3] gas sensors, [4][5][6] lithium ion batteries, [7][8][9][10] and solar cells. [11][12][13] Thus, synthesis of SnO 2 nanostructures with well-defined morphologies, highly reactive surfaces and tunable nonstoichiometric defects have attracted intense research interests due to their shape, size, surface and composition dependent properties.…”

Controlled Synthesis of Monodisperse Sub‐100 nm Hollow SnO2 Nanospheres: A Template‐ and Surfactant‐Free Solution‐Phase Route, the Growth Mechanism, Optical Properties, and Application as a Photocatalyst

“…However, to the best of our knowledge, reports on the template-and surfactant-free synthesis of sub-100 nm hollow SnO 2 nanospheres are very scarce so far. [18] Large-scale fabrication of sub-100 nm tin oxide nanostructures in a controlled manner is of great interest for the development of new materials with potential applications in nanotechnology.…”

Improvement of Chromatographic Detection Unit

“…Fig.6 shows two devices response curve for different concentrations measurement, entire measurement range, and single-column module for the gas response are non-linear response; although the double-column module reduces the response sensitivity, clearly see the linear response relationship. The non-linear response makes the device time-consuming and difficult to calibrate [9][10][11] . Double-column module can greatly reduce the workload and time of device calibration and improve the accuracy of the device.…”