New insights into multi-hierarchical nanostructures with size-controllable blocking units for their gas sensing performance
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The assembly design of nanostructures has taken a dominated position in improving gas sensing properties. In our work, multi-hierarchical (nanoneedles assembled and nanosheets assembled) SnO2 nanostructures with size-controllable blocking units were synthesized via facile hydrothermal method. As is recorded, the addition of PVP led to the transformation from nanoneedles assembled nanostructures into nanosheets assembled nanostructures, which can be ascribed to linear molecule structures. While the sizes of the blocking units can be controlled by the temperature due to the Ostwald ripening. And seeing from the gas sensing measurement, the thinner ones had higher gas response and quicker gas response and recovery judging from the sizes of blocking units, at the same time, nanoneedles assembled hierarchical structures possessed higher gas response while nanosheets assembled hierarchical structures had shorter gas response and recovery time.
KeywordsSnO2 Blocking Unit Hierarchical Nanostructures SnO2 Nanostructures Facile Hydrothermal Method
This research is funded by Chongqing Research Program of Basic Research and Frontier Technology (No. cstc2016jcyjA0006) and Graduate Scientific Research and Innovation Foundation of Chongqing, China (Grant No. CYS16008).
- 6.H. Bagheri, E. Ranjbari, M. Amiri-Aref, A. Hajian, Y.H. Ardakani, S. Amidi, Modified fractal iron oxide magnetic nanostructure: a novel and high performance platform for redox protein immobilization, direct electrochemistry and bioelectrocatalysis application. Biosens. Bioelectron. 85, 814–821(2016)CrossRefGoogle Scholar
- 8.H. Bagheri, A. Hajian, M. Rezaei, A. Shirzadmehr, Composite of Cu metal nanoparticles-multiwall carbon nanotubes-reduced graphene oxide as a novel and high performance platform of the electrochemical sensor for simultaneous determination of nitrite and nitrate. J. Hazard Mater. 324, 762–772 (2017)CrossRefGoogle Scholar
- 22.J.R. Huang, Y.J. Wu, C.P. Gu, M.H. Zhai, K. Yu, M. Yang, Large-scale synthesis of flowerlike ZnO nanostructure by a simple chemical solution route and its gas-sensing property. Sens. Actuators B. 146, 12–206 (2010)Google Scholar