Synthesis of Co-doped SnO2 nanofibers and their enhanced gas-sensing properties

Kou, Xueying; Wang, Chong; Ding, Meng; Feng, Changhao; Li, Xin; Ma, Jing; Zhang, Hong; Sun, Yangyang; Lu, Geyu

doi:10.1016/j.snb.2016.06.006

Cited by 130 publications

(41 citation statements)

References 42 publications

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“…Submicron and nanometric fibers have been studied in order to obtain systems with greater flexibility and desired properties for several applications [192]. HAp fibers have been used as another form of production of this material, as well as other biocompatible matrices to prepare composites that offer a solution to the problem of low mechanical resistance of HAp bodies [193][194][195][196]. CaP fibers can be obtained by different spinning techniques, starting from synthesis via sol-gel, followed by a direct spinning process as ES, a relatively simple and versatile top-down method for the generation of 1D nanostructures [193,197].…”

Section: Combination Of Methodsmentioning

confidence: 99%

A brief review on hydroxyapatite production and use in biomedicine

et al. 2019

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Hydroxyapatite (HAp) is a bioceramic widely studied due to its chemical similarity with the mineral component of bones. Besides, it is biocompatible, bioactive and thermodynamically stable in the body fluid what poses it as an attractive material for a wide range of applications in the biomedical field. Several efforts have been focused on the synthesis of particles of this material aiming to the precise control of size and morphology, porosity and surface area. HAp is widely used as an implant for bone tissue regeneration, as a coating for metallic implants and in a drug-controlled release. In this sense, the objective of this review is to gather information related to HAp, providing readers with information about synthesis methods, material characteristics and their applications.

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Section: Combination Of Methodsmentioning

confidence: 99%

A brief review on hydroxyapatite production and use in biomedicine

et al. 2019

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“…Y. Liu et al [12] reported the hydrothermal synthesis of hierarchical SnO 2 nanostructures, which exhibited an excellent sensitivity to ethanol gas at a temperature of 300 • C. Sun et al [13] also fabricated SnO 2 hierarchical architectures by a hydrothermal synthesis method, and these SnO 2 structures demonstrated a superior high response to ethanol at the optimal operating temperature of 275 • C. Wei et al [14] successfully synthesized flower-like SnO 2 hierarchical nanostructures using SnSO 4 as the tin source and water as the solvent, and these nanostructures exhibited good n-butanol gas sensing properties at 160 • C. Sensing materials with porous structures, which create more channels for gas diffusion and reactions, have also been synthesized [15]. Noble metals such as Co [16], Au [17,18], Pt [19,20] and Ag [21] have been used to decorate the surface of SMOs to enhance gas adsorption and lower the reaction activation energy.…”

Section: Introductionmentioning

confidence: 99%

A Highly Sensitive and Selective ppb-Level Acetone Sensor Based on a Pt-Doped 3D Porous SnO2 Hierarchical Structure

Quan

Min

et al. 2020

Sensors

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In view of the low sensitivity, high operating temperature and poor selectivity of acetone measurements, in this paper much effort has been paid to improve the performance of acetone sensors from three aspects: increasing the surface area of the material, improving the surface activity and enhancing gas diffusion. A hierarchical flower-like Pt-doped (1 wt %) 3D porous SnO2 (3DPS) material was synthesized by a one-step hydrothermal method. The micropores of the material were constructed by subsequent annealing. The results of the experiments show that the 3DPS-based sensor's response is strongly dependent on temperature, exhibiting a mountain-like response curve. The maximum sensor sensitivity (Ra/Rg) was found to be as high as 505.7 at a heating temperature of 153 °C and with an exposure to 100 ppm acetone. Additionally, at 153 °C, the sensor still had a response of 2.1 when exposed to 50 ppb acetone gas. The 3DPS-based sensor also has an excellent selectivity for acetone detection. The high sensitivity can be explained by the increase in the specific surface area brought about by the hierarchical flower-like structure, the enhanced surface activity of the noble metal nanoparticles, and the rapid diffusion of free-gas and adsorbed gas molecules caused by the multiple channels of the microporous structure.

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“…Oxygen species mainly exist in the form of O 2À when the temperature exceeds 300 C. 44 The reaction can be described by the following steps. [45][46][47] O 2 (gas) / O 2 (ads)…”

Section: The Gas Sensing Mechanismmentioning

confidence: 99%