???????100nm?10nm?1nm?,???????????????100?? - PowerPoint PPT Presentation

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Title:

???????100nm?10nm?1nm?,???????????????100??

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Title: Author: 522648 Last modified by: Created Date: 8/14/2005 10:41:31 AM Document presentation format: – PowerPoint PPT presentation

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Tags: 100nm | 10nm | 1nm | dioxide | titanium

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Title: ???????100nm?10nm?1nm?,???????????????100??


1
?????????
??????
2
???????????
?????????????????????????,?????????,?????,????????
?????????????? ?????????????????????????,????????
?????,???????????,???????,??????????,?????????????
?????????,????????? ???????,?????????????,????????
???????????,????????????,?????????????,????,??????
?????
???????????????? ????????????????? ??,????????
3
??????????
????????????????????????,????????????,????????????
?????,?????? ???????????
4
?????????????????,??????????????,???????????????(1
100nm)????????,?????????? ??????????????
???????100nm?10nm?1nm?,???????????????100??
5
???????????????
????
?????????????,????????????????????,????????,??????
???????????? ???????RuO2????????zeolite??,????RuO
2????????,??????????zeolite????RuO2???,?RuO2??????
?????????????? ?????1.3nm???
6
??????
??????????????,??????????,????????,???????????????
?
?????????????
?????????????????????
????????????????????,????????,??????????,?????????
????????
??????????????,????????????????,??????,???????????
???????,???????????????????,???????,??????,???????
???????????????????????????
7
????(Lotus leaf effect)
??Lotus leaf effect?????????????????,?????????????
??,????????????????????,?? ???????????????????,???
???????
???????????
???????????????????,?????????????????(???0.02nm)??
????,??????????????,????????????????(????????????
????),?????????,??????,???????
8
??????????
??????,???????,??????????????????????????,????????
?????? ?,??????????????????
???????????10nm???,????????????????????,??????????
????????????????,????????? ??(Quantum Size
Effect) ?
9
?????????,???????,????????,?????????????????,????
??????????????????????(Quantum Confinement),??????
???????????, ?????
????????,???????????????????????????????????,?????
?????????????????,?????????????
10
??????????
???????????????????????? ??????????????????,??????
????????? ????????????????????????????????? ??,??
???????,??????????????????????,??????????????(phot
ocatalysis)???
???(photocatalysis)??
????????????,?????????,??????????(catalyzed
photoreaction) ????????,?????????????????,????????
(sensitized photoreaction)
11
????????
Linsebiger???1995???????????????????????????,?????
??????????????? ??????? ????????????????,?SiO2?Al2
O3,???? ?????????????????
?????????????? ???????(a)??? ???????????,???(????
?)???????????,????????????,??,??????? ????,??(b)??
?
??????????
12
????????
??????,???????,????????????,????,?????????????,???
????????????,?????, ???????????(??)????,??????????
??,?????????????????????????????,?????????????????
??OH??O2-?????,?????????????? ????????????????????
?????, ???????????????
?????????????TiO2?ZnO?Nb2O5?WO3?SnO2?ZrO2?????CdS?
ZnS????, ????????(Titanium Dioxide, TiO2)
???????????,????????????,???????????????????
13
?????N????,???????????,??Ti?????,???6??????????6??
???,??Ti????22???,????3d???4?????????? ????
?????????(anatase, A type) ????(rutile, R
type)????(brookite)?????????????
????????????????
14
??????????????
?????????????????????????
15
???????
??????????????,?????(??????) ????????????????,????
????,???????????????? ????400nm???????????TiO2?,??
??(valence band, VB)???(e-)???????(?3eV)??,?????(c
onduction band, CB),????????????????(hole),???????
-???,??????? ??(?sec)????,???????????????
??????????????,???????(bandwidth)???????????????3.
2eV???????????,???????????????????,??388nm???????
16
???????????????????????,??????H2O?O2????,?????????
???????O-??O2-??O3-??O??OH,? ????????????????? ??
???????????????????????????????????????,???????? ?
?,????????
??????????,????????????????????????,??????????????
???,?????????????? ??????????,?????????,??????????
??????,????????????????,?????????????
TiO2????????
17
?????
???????????????????????,????????????,?????????????
?,????????????????????????????????????,???????????
???????????????????????????,??????????????????????
?,?????????????
18
??????????
???????????????????,???????, ???????,?????????????
???????? ?????? ????????,?????????????????? ?????
?????????????????,?????? ??????????????? ?????????
???????????????????? ????
19
??????????
?????????????,??????,??????????,??????????????????
??????????????????????,???????????(?????)????????
?,?????????,??????????????????(????????)? ???????
???,????????????????????,?????????????,????????? ?
,???????????????
??????
?????????????????????,???????????,??????????,?????
?????,??????????,???????????????????,?????????????
?,?????????
20
??????
?????????,???????????????,????????,?????????,?????
????,????????????????????????,?????1,???????????
????????????????????????????,?????????????????????
????????? ????????????? ???????,??????????,???????
???????,?????????,?????????????,?????? ?????? ????
???????????????,???????????,?????????,?????????,??
?????????, ????????????,????????????? ????????????
?,???????????????,?TiO2????200350nm?????(400700n
m)????????? 1550nm?,?????,????????????????? ????
???????????????????????????? ??????,??????????????
21
???????
????????????
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