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	Prolonged excited-state lifetime of porphyrin due to the addition of colloidal sio2 to triton x-100 micelles
	Yu, JH; Wang, XS; Zhang, BW; Weng, YX; Zhang, L
刊名	Langmuir
	2004-03-02
卷号	20期号:5页码:1582-1586
ISSN号	0743-7463
DOI	10.1021/la035704b
通讯作者	Wang, xs()
英文摘要	A water-insoluble porphyrin derivative was studied in triton x-100 micelles by steady-state spectroscopy and picosecond photolysis. the porphyrin in micelles formed j aggregates, and, consequently, the excited state lifetime of such a porphyrin was very short. after the addition of colloidal sio2, the b-band absorption blue-shifted, forming a broad absorption peak. this peak can be ascribed to the monomer-dominated absorption of porphyrin. the photolysis experiment showed that the dynamic curve of the porphyrin with sio2 exhibited a rapid recovery plus an offset resulting from the s-1 state absorption. the long lifetime part constituted about half of the total absorption. such a long-lifetime component could be ascribed to the absorption of monomeric porphyrin. the fluorescence near-field scanning optical microscopy showed that the porphyrin in the presence of sio2 exhibited stronger fluorescence images compared with that in the absence of sio2, though the topography images of the these samples were similar. the monomeric dispersion of porphyrin in sio2 solution may be due to its inset in the fragmented bilayers on the surface of the sio2 particles, assisted by the hydrogen bond between the amino group and the ionized silanol of sio2. the prolonged excited lifetime can be greatly beneficial to the application of porphyrin in heterogeneous photosensitization or photocatalysis.
WOS关键词	SNO2 NANOCRYSTALLITES ; NONIONIC SURFACTANTS ; ELECTRON-TRANSFER ; REVERSE MICELLES ; SILICA-GEL ; INTERFACE ; FLUORESCENCE ; ADSORPTION ; PHOTOSENSITIZATION ; PHOTOCHEMISTRY
WOS研究方向	Chemistry ; Materials Science
WOS类目	Chemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000189241500009
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2373971
专题	物理研究所
通讯作者	Wang, XS
作者单位	1.Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Yu, JH,Wang, XS,Zhang, BW,et al. Prolonged excited-state lifetime of porphyrin due to the addition of colloidal sio2 to triton x-100 micelles[J]. Langmuir,2004,20(5):1582-1586.
APA	Yu, JH,Wang, XS,Zhang, BW,Weng, YX,&Zhang, L.(2004).Prolonged excited-state lifetime of porphyrin due to the addition of colloidal sio2 to triton x-100 micelles.Langmuir,20(5),1582-1586.
MLA	Yu, JH,et al."Prolonged excited-state lifetime of porphyrin due to the addition of colloidal sio2 to triton x-100 micelles".Langmuir 20.5(2004):1582-1586.

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