Synthesis of multifarious hierarchical flower-like SnO2 and their gas-sensing properties

Synthesis of WO3 flower-like hierarchical architectures and their sensing properties

“…Therefore, the microflowers owing to large surface areas associated with great surface activity are likely to increase the oxygen species and promote the reaction on the WO 3 surface at lower temperature, which result in the enhancement in gas response and decrease in its operating temperature. The similar results have been also reported in the previous references[35,[38][39][40], indicating that the unique hierarchical microflowers with many petals, pores and intervals are very good candidate for gas sensor.The temporal responses of the sensors made of nanosheets and microflowers synthesized at CA/W of 0 and 1, respectively, upon exposure to 100 ppm ethanol gas at 250°C are shown inFig. 7.…”

Synthesis of morphology controlled SnO2 and its oxygen storage capacity

“…Aggregates of SnO 2 nanoparticles were also prepared using the solvothermal reaction [19] . 0.05 mol SnCl 2 •2H 2 O, 0.62 mmol Na 3 C 6 H 5 O 7 and 0.035 mol NaOH were mixed with 40 ml of 50 vol% ethanol aqueous solution, then introduced into a 100 ml Teflon ® -lined autoclave, then heated at 180˚C for 12 h, then allowed to cool to room temperature naturally.…”

“…During the solvothermal reaction and the following calcination, D-glucose was oxidized to CO 2 , and released to form the hollow structure [18] . The aggregates of SnO 2 nanoparticles were likely formed during the annealing process [19]. Large amount of nanoparticles were generated in the solution under solvothermal M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT reaction conditions, however, nanoparticles were easily aggregated during the following annealing process, resulting in the decrement of the specific surface area.…”

“…SnO 2 is one of the candidate materials for the novel co-catalyst, since the valence of SnO 2 can change from Sn 4+ to Sn 2+ reversibly, similar to that of CeO 2 , which changes from Ce 4+ to Ce 3+ reversibly [15][16][17] . In addition, it is easy to control the morphology of SnO 2 particles through the use of a variety of synthesis methods, and the OSC of SnO 2 is expected to be improved by controlling the morphology and chemical modification [18][19][20] .…”

Effect of the sheet thickness of hierarchical SnO 2 on the gas sensing performance

“…In recent years, diverse nanostructures and different morphologies [24][25][26]6,[27][28][29][30][31][32][33] have been reported in succession, in which the complex three-dimensional (3D) nanoflower has received a huge amount of attention [34,35,9]. The 3D-structure is characterized by robust structure, broad internal space and large surface area, that all contribute to the long service life, sufficient diffusion path and enough reactive sites of the materials [36][37][38].…”