acetone sensing characteristics of zno hollow spheres prepared by

... mechanism of ZnO hollow spheres and the effect of hollow morphology on the acetone sensing characteristics. 2. Experimental Preparation of ZnO hollow sphere: ZnO hollow spheres were prepared by a ... Acetone sensing characteristics of ZnO hollow spheres prepared by one-pot hydrothermal reaction Peng Song n , Qi Wang, Zhongxi Yang School of...

Ngày tải lên: 06/05/2014, 13:22

... patterns of the R30, R5, and R0.5 powders prepared by HT of precursors at 450 ◦ C for 1 h. The R30 powders Fig. 2. X-ray diffraction patterns of the powders prepared by heat treatment of (a) R30, ... carbon microsphereswith hydrophilic surface by the hydrothermal reaction of glucose and demonstrated the reactiv- ity of carbon spheres through the uniform coating of Ag...

Ngày tải lên: 19/03/2014, 16:48

... addition of Pd to the WO 3 surface, i.e. increase of resistance and decrease of sensi- tivity. This could be caused by the oxidation of palladium on the surface or by the formation of a bimetallic ... effect. The transient responses of Fig. 4b, suggested that one of the two steps of the reaction (8) resulting of the O 3 dissociation is enhanced by the presence of the...

Ngày tải lên: 19/03/2014, 16:48

... process can offer the product rapidly within a short time with a high degree of control of particle size and morphology [18]. Recently, we have prepared WO 3 ÁnH 2 O nanospheres by a simple MH ... However, most of studies focused on WO 3 film made of large particles. Fig. 1. Powder XRD pattern of WO 3 nanorods prepared by microwave hydrothermal process. Fig. 2. EDX spectrum...

Ngày tải lên: 05/05/2014, 15:27

... In(III) ZnO- In(OH) 3 5 at. % In(III) ZnO d (100) ZnO d (201) ZnO d (112) ZnO d (200) ZnO d (103) ZnO d (110) ZnO d (102) ZnO d (101) ZnO d (002) ZnO d (202) ZnO d (004) 200 cps In(OH) 3 d (200) In(OH) 3 d (220) In(OH) 3 d (420) In(OH) 3 d (400) Fig. ... ( μ g/cm 2 ) prism-like ZnO ZnO- In(OH) 3 5 at. % In(III) ZnO- In(OH) 3 10 at. % In(III) ZnO- In(OH) 3 1 at...

Ngày tải lên: 06/05/2014, 13:24

... to increase in response of tungsten oxide sensor with decrease in grain size as reported by Tamaki et al. [13]. The sensing properties of WO 3 film are also controlled by the surface defects [18]. ... working principle ofthese sensorsis based on the detection of a change in resistance on exposure to a gas. Due to the constraints of gas permeation only the surface layers are affec...

Ngày tải lên: 19/03/2014, 16:48

Ngày tải lên: 14/03/2014, 13:20

... and morphology control of TiO 2 nanostructured films for gas sensor applications were inves- tigated. To examine the effect of the morphology of sensing films on the sensing characteristics, TiO 2 with different ... this study, we fabricated porous gas sensing filmscomposed of TiO 2 nanotubes prepared by a hydrothermal treatment and studied the gas sensing properties of th...

Ngày tải lên: 19/03/2014, 16:48

... Thus the influence of Debye length on the binder-dependent sensing characteristics should be marginal. One may imagine that the grain size affects some sensing characteristics of our samples since ... NO gas. x sensing characteristics of the polycrystalline WO sensors 3 mainly through the chemical nature of GB and the distribu- tion of interface states. Fig. 6 shows the...

Ngày tải lên: 20/03/2014, 13:04

... caused by the adsorption and des- orption of gas molecules on the surface of the sensing structure. To understand the origin of the difference in the sensing perfor- mance of the three kinds of sensors, ... layer of radially oriented nanorods with a diameter of about 120 nm,self-wrapping to form hollow interior(inset ofFig. 3d). TEM is employed to study the structural c...

Ngày tải lên: 05/05/2014, 15:26