title: Morphological Evolution of Single-Crystal Ag Nanospheres during the Galvanic Replacement Reaction with HAuCl(4).
abstract: This paper presents a systematic study of the galvanic replacement reaction between 23.5 nm single-crystal Ag nanospheres and HAuCl(4) in an aqueous medium. We have monitored both morphological and spectral changes as the molar ratio of HAuCl(4) to Ag is increased. The replacement reaction on single-crystal Ag nanospheres results in the formation of a series of hollow and porous nanostructures composed of Au-Ag alloys. By varying the molar ratio of HAuCl(4) to Ag, we are able to control the size and density of the pores. In addition, the localized surface plasmon resonance peaks of these nanostructures can be readily tuned from 408 to 791 nm as the product becomes increasingly more hollow and porous.
authors.affiliation: Department of Biomedical Engineering, Washington University, Saint Louis, Missouri 63130.
authors.forename: Mun Ho
authors.initials: MH
authors.lastname: Kim
authors.forename: Xianmao
authors.initials: X
authors.lastname: Lu
authors.forename: Benjamin
authors.initials: B
authors.lastname: Wiley
authors.forename: Eric P
authors.initials: EP
authors.lastname: Lee
authors.forename: Younan
authors.initials: Y
authors.lastname: Xia
references.citation: J Am Chem Soc. 2006 Oct 4;128(39):12671-3
references.pmid: 17002360
references.citation: J Am Chem Soc. 2006 Nov 22;128(46):14776-7
references.pmid: 17105266
references.citation: Chem Commun (Camb). 2005 Apr 7;(13):1684-6
references.pmid: 15791298
references.citation: Nano Lett. 2006 Aug;6(8):1822-6
references.pmid: 16895380
references.citation: J Am Chem Soc. 2004 Mar 31;126(12):3892-901
references.pmid: 15038743
references.citation: Angew Chem Int Ed Engl. 2006 Jul 10;45(28):4597-601
references.pmid: 16791902
references.citation: Acc Chem Res. 2001 Apr;34(4):257-64
references.pmid: 11308299
references.citation: Nano Lett. 2005 Oct;5(10):2058-62
references.pmid: 16218737
references.citation: J Phys Chem B. 2005 Oct 20;109(41):19208-12
references.pmid: 16853479
references.citation: Nano Lett. 2005 Mar;5(3):473-7
references.pmid: 15755097
references.citation: J Am Chem Soc. 2007 Feb 14;129(6):1733-42
references.pmid: 17243691
references.citation: J Am Chem Soc. 2004 Aug 4;126(30):9399-406
references.pmid: 15281832
references.citation: Nano Lett. 2005 Jul;5(7):1237-42
references.pmid: 16178217
references.citation: Technol Cancer Res Treat. 2004 Feb;3(1):33-40
references.pmid: 14750891
references.citation: Anal Chem. 2006 Jul 1;78(13):4732-6
references.pmid: 16808490