Preparation of grain size-controlled tin oxide sols by hydrothermal treatment for thin film sensor application

Zhu

et al. 2007

Adv Funct Materials

521

344

Hierarchical assembly of hollow microstructures is of great scientific and practical value and remains a great challenge. This paper presents a facile and one‐pot synthesis of Cu2O microspheres with multilayered and porous shells, which were organized by nanocrystals. The time‐dependent experiments revealed a two‐step organization process, in which hollow microspheres of Cu2(OH)3NO3 were formed first due to the Ostwald ripening and then reduced by glutamic acid, the resultant Cu2O nanocrystals were deposited on the hollow intermediate microspheres and organized into finally multishell structures. The special microstructures actually recorded the evolution process of materials morphologies and microstructures in space and time scales, implying an intermediate‐templating route, which is important for understanding and fabricating complex architectures. The Cu2O microspheres obtained were used to fabricate a gas sensor, which showed much higher sensitivity than solid Cu2O microspheres.

Section: Full Papermentioning

confidence: 86%

One‐Pot Synthesis and Hierarchical Assembly of Hollow Cu₂O Microspheres with Nanocrystals‐Composed Porous Multishell and Their Gas‐Sensing Properties

Zhu

et al. 2007

Adv Funct Materials

521

344

“…Li et al 21 reported that the gas responses of mesoporous SnO 2 -based sensors to hydrogen and carbon monoxide increase as the size of the pores increase from 1 to 10 nm. Vuong et al 22 also reported that the hydrogen response of nanocrystalline SnO 2 thin Potential of SnO 2 spheres with trimodal pores J-W Yoon et al films increases as the mesopore size increases. Thus the pore size is an important parameter for the diffusion of gas through mesoporous structures.…”

Section: Gas-sensing Characteristicsmentioning

confidence: 96%

Trimodally porous SnO2 nanospheres with three-dimensional interconnectivity and size tunability: a one-pot synthetic route and potential application as an extremely sensitive ethanol detector

et al. 2016

The rapid and effective transfer of chemical reactants to solid surfaces through porous structures is essential for enhancing the performance of nanomaterials for various energy and environmental applications. In this paper, we report a facile one-pot spray pyrolysis method for preparing highly reactant-accessible and porous SnO 2 spheres, which have three-dimensionally interconnected and size-tunable trimodal (microscale, mesoscale and macroscale) pores. For this synthetic method, macroscale polystyrene spheres and mesoscale-diameter, long carbon nanotubes were used as sacrificial templates. The promising potential of the SnO 2 spheres with trimodal pores (sizes ≈3, 20 and 100 nm) was demonstrated by the unprecedentedly high response to several p.p.b. levels of ethanol. Such an ultrahigh response to ethanol is explained with respect to the hierarchical porosity and pore-size-dependent gas diffusion mechanism.

“…Semiconductor oxides have been more successfully employed as sensing materials for the detection of different gases, such as CO, CO 2 , H 2 , alcohol... Both n-type (such as SnO 2 , TiO 2 and ZnO) and p-type semiconductor oxides (NiO) can be used as gas sensor materials [3]. Among these semiconductor oxides, tin dioxide (SnO 2 ) is an n-type semiconductor with a wide band gap and high chemical stability.…”

Section: Introductionmentioning

confidence: 99%

“…Among these semiconductor oxides, tin dioxide (SnO 2 ) is an n-type semiconductor with a wide band gap and high chemical stability. It has been widely applied for various devices, such as gas sensor, dye-base solar cell and transparent conducting electrodes [5][6][7][8]. As the gas sensing and other properties of SnO 2 materials are strongly dependent on their size and shape, it is obvious that the controlled synthesis of the nano/microstructure of SnO 2 materials is very important for special applications [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of SnO$_{2}$ Nanorods by Hydrothermal Method for Gas Sensor Application

Trung¹,

Hien

Vuong

et al. 2012

Comm. in Phys.

Self Cite

Abstract. SnO2 nanorods have been successfully prepared by hydrothermal method using tin chloride, ammonia, sodium hydroxide and cetyltrimethyl ammonium bromide (CTAB) as starting materials. Structural properties and surface morphologies of the SnO2 nanorods were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results show that diameters of the nanorods are around 100 nm to 300 nm with length of several micrometers. In the preparation process of nanorods, the surfactant CTAB plays an important role in the formation and growth processes of SnO2 nanorods. The gas sensitivity experiments have demonstrated that the SnO2 nanorods exhibit a good sensitivity to alcohol vapors, which may offer potential applications in the gas sensors.