Template Synthesis of Nanostructured Metals Using Cellulose Nanocrystal - The Nanoscience and Technology of Renewable Biomaterials - page 324

Figure12.7 FE-SEM(a)and(c)andTEMimage(b)and(d)ofNi(a)and(b)andCu(c)and(d)
productstreatedat500 ◦ C.Aninset in(b)donotesaselectedareaelectrondiffraction(SAED)
(reprintedwithpermissionfromref46).Copyright2007Elsevier.

nH + + ne −

[C 6 H 10 O 5 ] n → n[CO 2 ] + 5nC + (12.2)

M 2 + + 2e − → M 0 ( M = Ni, Cu ) (12.3)

This 'green reducing' process can be easily applied for the preparation of other transition
metal nanoparticles, which have high oxidizing property, without additional reducing
agents.

12.4.2 Precious Metal Nanoparticles: Ag, Au, Pd, Pt

Precious metal ions containing Ag(I), Au(III), Pt(IV), and Pd(II), have relatively high
reduction potentials (49), and thus require lower temperatures to initiate reduction of the
metal ions. The lower heat treatment (160-200 ◦ C) can be applied to reduce the metal
ions in air. CNXL is also stable at this temperature range. The addition of metal ion
solutions to CNXL dispersion destabilizes them and causes phase separation. Addition