• LAL-generated NMs display unique reactivity …can be used as precursors for preparing new materials
• Laser-generated NMs show unique application …in catalyst, biosensor etc.
More products can be synthesized·····
Nb in ethonal
NbC@C
Mo in ethonal
MoxC@C
Co in acetone
Co3C@C
the formation process of carbon-encapsulated metal carbides
A AA
or A
A+B
A+ B
= C → New compounds
C
=AB → Composites
AB
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
2. LAL-based synthesis of ternary oxides
J. Mater. Chem., 2012, 22, 17210–17214
Design for ternary oxides based on A + B = C
various ternary oxides
Morphology, structure and size can be modified…
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1. LAL-based to fabricate carbon-encapsulated metal carbides
Tantalum target
pulse laser
acetone target
TaC@C NPs
Carbon, 2013, 55, 108–115
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
液体中激光烧蚀法制备纳米材料
Basic mechanism of LAL(laser ablation in liquids)
Sketch of the main stages of LAL
Phys. Chem. Chem. Phys., 2013, 15 , 3027--3046
Basic mechanism of LAL
Capped with various stable reagents to prevent aggregation or reaction
Stable and surface passivated
Aቤተ መጻሕፍቲ ባይዱtivity and Reactivity
A (assemble or growth) A + A
Reaction temperature Reaction time pH value
3. LAL-based complex oxide–noble metal nanocomposites
Adv. Mater. 2013, 25, 2040–2044
Brief Summary
• LAL-generated NMs present unique activity, …beneficial for obtaining new properties and new structures
Basic mechanism of LAL
FeO Nanoparticles by LAL
Adv. Funct. Mater. 2012, 22, 1333–1353
Nanoparticles Derived from LAL method
Ultra-small size distribution Metastable structure Unoccupied/charged surfaces
LALinduced
NPs
Quantum size effects New structures and properties Easy-functionalization
High activity and reactivity
Nanoparticles Synthesized by Chemical Routes