• Title, Summary, Keyword: $SnO_2$

Search Result 1,455, Processing Time 0.05 seconds

Synthesis and Photocatalytic Properties of SnO2-Mixed and Sn-Doped TiO2 Nanoparticles

  • Choi, Hong-Goo;Yong, Seok-Min;Kim, Do-Kyung
    • Korean Journal of Materials Research
    • /
    • v.22 no.7
    • /
    • pp.352-357
    • /
    • 2012
  • $SnO_2$-mixed and Sn-doped $TiO_2$ nanoparticles were synthesized via a hydrothermal process. $SnO_2$-mixed $TiO_2$ nanoparticles prepared in a neutral condition consisted of anatase $TiO_2$ nanoparticles(diamond shape, ~25 nm) and cassiterite $SnO_2$ nanoparticles(spherical shape, ~10 nm). On the other hand, Sn-doped $TiO_2$ nanoparticles obtained under a high acidic condition showed a crystalline phase corresponding to rutile $TiO_2$. As the Sn content increased, the particle shape changed from rod-like(d~40 nm, 1~200 nm) to spherical(18 nm) with a decrease in the particle size. The peak shift in the XRD results and a change of the c-axis lattice parameter with the Sn content demonstrate that the $TiO_2$ in the rutile phase was doped with Sn. The photocatalytic activity of the $SnO_2$-mixed $TiO_2$ nanoparticles dramatically increased and then decreased when the $SnO_2$ content exceeded 4%. The increased photocatalytic activity is mainly attributed to the improved charge separation of the $TiO_2$ nanoparticles with the $SnO_2$. In the case of Sn-doped $TiO_2$ nanoparticles, the photocatalytic activity increased slightly with the Sn content due most likely to the larger energy bandgap caused by Sn-doping and the decrease in the particle size. The $SnO_2$-mixed $TiO_2$ nanoparticles generally exhibited higher photocatalytic activity than the Sn-doped $TiO_2$ nanoparticles. This was caused by the phase difference of $TiO_2$.

$SnO_2$ Dispersion of Sintered Body in $In_2O_3-SnO_2$ Binary System ($In_2O_3-SnO_2$ 이성분계 소결특성에 있어서 $SnO_2$ 분산성)

  • Chun, Tae-Jin;Park, Wan-Soo;Cho, Muyung-Jin;Kim, Jong-Su;Kim, Young-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.198-198
    • /
    • 2006
  • Tin doped $In_2O_3$ sputtering target is widely used to produce a various kinds of flat panel display because of high transmittance in visible region and high electrical conductivity. In2O3 and SnO2 powders were prepared by a homogeneous precipitation method using metal source, respectively, the calcining and sintering behavior of the indium-tin oxide(In2O3-SnO2) composite powders were studied. The tin oxide(SnO2) dispersion condition in ITO sputtering target was improved by increasing calcining temperature. And the tin oxide dispersion was also improved by reducing the tin oxide contents in the ITO target from 30 to 5wt%. SnO2 dispersion and densification of ITO target is very difficult to control due to sublimation of SnO2 at over 1150C.

  • PDF

Synthesis of ultrafine particles and thin films of $SnO_2$ by the spray-ICP technique (Spray-ICP technique에 의한 $SnO_2$미분말 합성 및 박막 제조)

  • 김정환;박종현;김영도;신건철
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.8 no.3
    • /
    • pp.487-492
    • /
    • 1998
  • Ultrafine particles of $SnO_2$ or $(Sn,Ti)O_2$ and thin films of $SnO_2$ were synthesized by introducing aqueous tin chloride solution into a high temperature argon inductively coupled plasma (ICP) generated under ambient pressure (the spray-ICP technique). As-deposited $SnO_2$ particles from each concentration of solution were all tetragonal $SnO_2$ crystallline phase and their mean size decreased in proportion to the increase of solution concentration. The mean size of $SnO_2$ particles was in the 10~40 nm range.

  • PDF

Photoelectron Spectroscopy Study of the Semiconductor Electrode Nanomaterials for the Dye Synthesized Solar Cell (염료감응 태양전지 전극용 반도체 나노 물질의 광전자분광 연구)

  • Kim, Hyun Woo;Lee, Eunsook;Kim, D.H.;Seong, Seungho;Kang, J.-S.;Moon, S.Y.;Shin, Yuju
    • Journal of the Korean Magnetics Society
    • /
    • v.25 no.5
    • /
    • pp.156-161
    • /
    • 2015
  • The electronic structures of the potential candidate semiconductor nanoparticles for dye-sensitized solar cell (DSSC), such as $ZnSnO_3$ and $Zn_2SnO_4$, have been investigated by employing X-ray photoemission spectroscopy (XPS). The measured X-ray diffraction patterns show that $ZnSnO_3$ and $Zn_2SnO_4$ samples have the single-phase ilmenite-type structure and the inverse spinel structure, respectively. The measured Zn 2p and Sn 3d core-level XPS spectra reveal that the valence states of Zn and Sn ions are divalent (Zn 2+) and tetravalent (Sn 4+), respectively, in both $ZnSnO_3$ and $Zn_2SnO_4$. On the other hand, the shallow core-level measurements show that the binding energies of Sn 4d and Zn 3d core levels in $ZnSnO_3$ are lower than those in $Zn_2SnO_4$. This work provides the information on the valence states of Zn and Sn ions and their chemical bonding in $ZnSnO_3$ and $Zn_2SnO_4$.

Comparative Study of Nitrogen Incorporated SnO2 Deposited by Sputtering of Sn and SnO2 Targets

  • Kim, Youngrae;Kim, Sarah Eunkyung
    • Journal of the Korean Ceramic Society
    • /
    • v.49 no.5
    • /
    • pp.448-453
    • /
    • 2012
  • Nitrogen-incorporated $SnO_2$ thin films were deposited by rf magnetron sputtering. Comparative structural, electrical and optical studies of thin films deposited by sputtering of the Sn metallic target and sputtering of the $SnO_2$ ceramic target were conducted. The $SnO_2$ thin films deposited by sputtering of the Sn metallic target had a higher electrical conductivity due to a higher carrier concentration than those by sputtering of the $SnO_2$ ceramic target. Structurally the $SnO_2$ thin films deposited by sputtering of the $SnO_2$ ceramic target had a better crystallinity and a larger grain size. This study confirmed that there were distinct and clear differences in electrical, structural, and optical characteristics between $SnO_2$ thin films deposited by reactive sputtering of the Sn metallic target and by direct sputtering of the $SnO_2$ ceramic target.

A Dual Micro Gas Sensor Array with Nano Sized $SnO_2$ Thin Film (나노 박막을 이용한 듀얼 $SnO_2$ 마이크로 가스센서 어레이)

  • Chung Wan-Young
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.10 no.9
    • /
    • pp.1641-1647
    • /
    • 2006
  • A dual micro gas sensor way for detecting reducing gas and bad order was fabricated using nano sized $SnO_2$ thin film fabrication method. To make nano-sized thin gas sensitive $SnO_2$ thin rilm, thin tin metal layer $2500{\AA}$ thick was oxidized between 600 and $800^{\circ}C$ by thermal oxidation. The gas sensing layers such as $SnO_2,\;SnO_2(+Pt)\;and\;SnO_2(+CuO)$ were patterned by metal shadow mask for simple fabrication process on the silicon substrate. The micro gas sensors with $SnO_2(Pt)$ and $SnO_2(+CuO)$ showed good selectivity to CO gas among reducing gases and good sensitivity to $H_2S$ that is main component of bad odor, separately.

Gas Sensing Characteristics of La$_2$O$_3$-SnO$_2$Thick Film to COLa$_2$O$_3$-SnO$_2$ Gas (La$_2$O$_3$-SnO$_2$계 후막 소자의 $CO_2$감지특성)

  • 김동현;윤지영;박희찬;김광호
    • Journal of the Korean Ceramic Society
    • /
    • v.36 no.3
    • /
    • pp.301-306
    • /
    • 1999
  • CO2 감지용 La2O3-SnO2 계 후막형 소자를 제조하여 CO2가스에 대한 기초 감지 특성을 조사하였고, 감지 분말의 입자크기와 제조방법에 따른 감도 변화를 고찰하였다. 후막 소자는 40$0^{\circ}C$의 작동온도와 4wt.%의 La2O3가 첨가되 srjt에서 가장 좋은 감도를 나타내었고, 낮은 습도영역에서 우수한 감지 특성을 보였다. 분말 혼합법에 의해 제조된 소자에 있어서 La2O3와SnO2 분말의 입자가 미세할수록 우수한 감도를 나타내었고, La2O3의 입도가 SnO2의 입도 보다 감도에 더 큰 영향을 주었다. SnO2 후막 표면에 La 용액을 코팅하여 제조된 센서는 가장 우수한 CO2 감도특성을 보였다.

  • PDF

Phase Cooperation between Mo-V-O and SnO2 in Selective Oxidation of Acrolein -II. Supported Catalysts- (아크롤레인 선택 산화반응에서 Mo-V-O와 SnO2의 상간협동 - II. 담지촉매 -)

  • Park, Dae-Won;Na, Suk-Eun;Kim, Kyung-Hoon;Lee, Won-Ho;Chung, Jong Shik
    • Applied Chemistry for Engineering
    • /
    • v.5 no.2
    • /
    • pp.295-304
    • /
    • 1994
  • $Mo-V-O/SnO_2$(VM/Sn) and $SnO_2/Mo-V-O$(Sn/VM) catalysts have been prepared and characterized by XRD, BET, SEM and TPD of ammonia. The catalytic reaction of acrolein oxidation with these catalysts, in a continuous-flow fixed-bed reactor, showed that they had higher conversion of acrolein and higher yield of acrylic acid than those of Mo-V-O itself. The origin of the observed synergy studied by TPD, TPR and TPO is explained by the cooperation of $SnO_2$ and Mo-V-O at their interfaces where electrons flow from Mo-V-O phase to $SnO_2$ and $SnO_2$ produces spill-over oxygens, which, by being transported onto the surface of Mo-V-O, reoxidize the partially reduced active sites.

  • PDF

Effects of Sintering Atmosphere and Dopant Addition on the Densifcation of $SnO_2$ Ceramics (첨가제와 소결분위기가 $SnO_2$ 요업체의 치밀화에 미치는 영향)

  • 정재일;김봉철;장세홍;김정주
    • Journal of the Korean Ceramic Society
    • /
    • v.34 no.12
    • /
    • pp.1221-1226
    • /
    • 1997
  • The effects of sintering atmosphere and dopant addition on the behavior of densification and grain growth of SnO2 ceramics were investigated with consideration of defect chemistry. CoO and Nb2O5 were chosen as dopants, and oxygen and nitrogen were used for controlling of sintering atmospheres. With the decrease of oxygen partial pressure, densification was depressed due to evaporation of SnO2 ceramics. In the case of SnO2 sintering, the addition of CoO, which produced oxygen vacancy in SnO2 ceramics, led to acceleration of densification and grain growth. On the contrary, when Nb2O5 as a dopant producing Sn vacancy was added to SnO2 ceramics, densification and grain growth were simultaneously retarded. As results, it was conformed that diffusion of oxygen ions was rate determinant in densification and grain growth of SnO2 ceramics.

  • PDF

C3H8 Gas Sensitivity of Pd, Pt-$SnO_2$ Gas Sensor with Varying Impregnation Method (함침 방법의 차이에 따른 Pd, Pt-$SnO_2$의 프로판 가스 감응성 변화)

  • 이종흔;박순자
    • Journal of the Korean Ceramic Society
    • /
    • v.27 no.5
    • /
    • pp.638-644
    • /
    • 1990
  • The C3H8 gas sensitivities of SnO2, Pd-SnO2, Pt-SnO2 gas sensor are looked over with the impregnation method of PdCl2, H2PtCl6 solution on SnO2. The Cl- ion due to incomplete decomposition of PdCl2 at 80$0^{\circ}C$ for 30 min decrease the C3H8 gas sensitivity of SnO2, and the sensitivity is increased by the impreganation of H2PtCl6 solution on SnO2 because of its lower decomposition temperature compared with PdCl2. The C3H8 gas sensitivities of Pd-SnO2, Pt-SnO2 impregnated slightly after 1st sintering are larger than that of pure SnO2 sensor because very small amount of Cl- ion exist in sample due to smaller amount of impregnaiton.

  • PDF