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ld12

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²ÉÓÃÈܽº£­Äý½º·¨ÖƱ¸TiO2Èܽº£¬¸ºÔØÓÚAl3O2±íÃæ£¬²ÉÓÃAr-N2Æø·Õ±ºÉÕ·¨ÖƵòôµªÄÉÃ×TiO2±¡Ä¤£»ÔËÓÃXÉäÏß·ÛÄ©ÑÜÉäÒÇ£¨XRD£©¡¢É¨Ãèµç¾µ£¨SEM£©ºÍ×ÏÍâÒ»¿É¼ûÂþ·´ÉäÎüÊÕ¹âÆ×µÈ¼¼Êõ£¬¿¼²ì²»Í¬±ºÉÕζȺ͸ºÔØ´ÎÊý¶ÔÆäÐÔÄܵÄÓ°Ïì¡£Ñо¿½á¹û±íÃ÷£º200¡æ¡¢250¡æºÍ300¡æÈÈ´¦ÀíµÄÑùÆ·µÄ¾§ÏàΪÈñîÑ¿óÏ࣬350¡æÊ±¿ªÊ¼³öÏÖ½ðºìʯÏ࣬ÇÒËæÎ¶ȵĽøÒ»²½Éý¸ß£¬½ðºìʯÏàµÄº¬Á¿Öð½¥Ôö¶à£»²ôµªµÄTiO2ÑùÆ·¾ßÓпɼû¹âÎüÊÕÐÔÄÜ£¬250¡æÈÈ´¦ÀíµÄÑùÆ·´ïµ½×î¼Ñ£¬ÆäÎüÊձߺìÒÆÖÁ600nm.


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   a series of nitrogen-doped nano-TiO2 films, coated on glass microballoons bysol-gel method,  were prepared by  sintering in a NH3 atmosphere. The as-synthesized films were characterized by XRD, SEM and UV-Vis diffuse reflectance spectroscopy,etc. The experimental results showed that,  XRD patterns indicated that crystalline phase of the samples sintered at 200¡ãC, 250¡ãC and 300¡ãC are anatase. When sintered beyond 350¡ãC, rutile TiO2 was produced and increased with the heating temperature. The UV-Vis diffuse response spectroscopy showed that all of the nitrogen-doped samples absorbd visible light obviously. The sample sintered at 250¡ãC exhibited a comparative excellent absorption property, which has red-shifted well into visible region up to 600 nm.

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[ Last edited by ld12 on 2009-9-19 at 10:50 ]

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lixiaod001

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2Â¥2009-09-19 11:07:25
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joan1101

Òø³æ (³õÈëÎÄ̳)

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ld12(½ð±Ò+10,VIP+0):лл°¡ 9-21 08:05
zap65535(½ð±Ò+5,VIP+0):²¹·¢ 12-22 12:44
The TiO2 sol was prepared by sol-gel method and coating at Al2O3 surface. The N-doped TiO2 nano-film was sythesized by calcining under an atmosphere of Ar-N2 . The effect of different sintering temperature and times of coating on the properties of the samples was charactertized by XRD, SEM and UV-vis diffuse reflectance and absorption spectra. The results reveals as follows: The samples  are anatase phase when heated at 200¡æ, 250¡æ and 300¡æ; rutile phase appeared in the sample when heated at 350¡æ; the fraction of rutile phase increased as the temperature rised; the N-doped TiO2 sample could absorb the visable light, and the one heated at 350¡æ was the optimum, the absorption edge of which red shifts to 600 nm.
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3Â¥2009-09-19 11:35:06
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yuyang031985

½ð³æ (ÕýʽдÊÖ)

¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï
ld12(½ð±Ò+10,VIP+0):лл 9-21 08:05
The TiO2 sol was prepared by sol-gel method and then coated at Al2O3 surface. The N-doped TiO2 nano-film was produced by calcining under Ar-N2 atmosphere. The effects of different sintering temperature and times of coating on the properties of samples were charactertized by XRD, SEM and UV-vis diffuse reflectance and absorption spectra. The results reveals as follows: The samples are anatase phase when heated at 200¡æ, 250¡æ and 300¡æ; rutile phase appeared in the sample when heated at 350¡æ; the fraction of rutile phase increased as the temperature rised; the N-doped TiO2 sample could absorb the visable light, and the one heated at 350¡æ was the optimum, the absorption edge of which red shifts to 600 nm.

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4Â¥2009-09-19 12:57:50
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smilingxue

Òø³æ (СÓÐÃûÆø)

¡ï ¡ï ¡ï ¡ï ¡ï
ld12(½ð±Ò+5,VIP+0):лл 9-21 08:05
ectµÄÒâ˼ÊÇÁгöÁËÒ»²¿·Ö£¬»¹ÓÐÒ»²¿·ÖûÁгö¡£The effects of different sintering temperatures and times of coating on the properties of samples were charactertized by XRD, SEM and UV-vis diffuse reflectance and absorption spectra. The results reveal as
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5Â¥2009-09-19 19:38:30
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cam967

½ð³æ (ÖøÃûдÊÖ)

The experimental results demostrate that......
6Â¥2009-09-19 23:10:42
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joan1101

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7Â¥2009-09-20 10:54:43
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monitor2885

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Retirement
8Â¥2009-09-20 13:47:51
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fangbj

ľ³æ (ÕýʽдÊÖ)

N-doped nano TiO2 films were prepared by calcining TiO2 sol in Ar-N2 atmosphere and coated on the surface of Al2O3. The influence of calcining temperature and coating times on electro properties of the obtained films were investigated by XRD, SEM and UV-Vis diffuse reflectance spectroscopy. Anatase phase is obtained for the films calcined at 200, 250 and 300¡æ. Rutile phase appears where the calcinations temperature reaches 350¡æ, which increase with the calcinations temperature. The N-doped TiO2 films calcined at 250¡æ exhibit best visible light absorption, where the infrared-absorption band moves to 600nm.
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9Â¥2009-09-22 15:08:30
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