液体中激光烧蚀法制备纳米材料.ppt

Group members：Ou Qian, Chao Zhang, Dan Jia, Yanping Su,
Lulu Wen, Gangfeng Wei, Yongkui Wang,
Dongfang Wang, Xiangyang Song,
Wen Wang, Haiying Zheng.
Nanomaterials Generated by Laser Ablation in Liquids
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Basic mechanism of LAL(laser ablation in liquids)
Sketch of the main stages of LAL
Phys. Chem. Chem. Phys., 2013, 15 , 3027--3046
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Basic mechanism of LAL
Sketch of the plasma plume formed by laser ablation of a metal target.
* Denotes excited and/or ionized states
Phys. Chem. Chem. Phys., 2009, 11 , 3805–3821
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Basic mechanism of LAL
FeO Nanoparticles by LAL
Adv. Funct. Mater. 2012, 22, 1333–1353
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Nanoparticles Derived from LAL method
Metastable structure
Ultra-small size distribution
Unoccupied/charged surfaces
Easy-functionalization
New structures and properties
Quantum size effects
High activity and reactivity
LAL-induced
NPs
Stable and surface passivated
Nanoparticles Synthesized by Chemical Routes
Capped with various stable reagents to prevent aggregation or reaction
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A (assemble or growth)
A + B
= C → New compounds
=AB → Composites
Activity and Reactivity
C
B
A
A
B
+
A
+
A
A
A
A
A
or
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Examples
1. LAL-based to fabricate carbon-encapsulated metal carbides
2. LAL-based synthesis of ternary oxides
3. LAL-based complex oxide–noble metal nanocomposites
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pulse laser
acetone
target
Tantalum target
1. LAL-based to fabricate carbon-encapsulated metal carbides
******@C NPs
Carbon, 2013, 55, 108–115
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******@C
******@C
******@C
Mo in ethonal
Nb in ethonal
Co in acetone
More products can be synthesized·····
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the formation process of carbon-encapsulated metal carbides
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