MilliporeSigma
  • Home
  • Search Results
  • Surface modification-induced phase transformation of hexagonal close-packed gold square sheets.

Surface modification-induced phase transformation of hexagonal close-packed gold square sheets.

Nature communications (2015-03-15)
Zhanxi Fan, Xiao Huang, Yu Han, Michel Bosman, Qingxiao Wang, Yihan Zhu, Qing Liu, Bing Li, Zhiyuan Zeng, Jumiati Wu, Wenxiong Shi, Shuzhou Li, Chee Lip Gan, Hua Zhang
ABSTRACT

Conventionally, the phase transformation of inorganic nanocrystals is realized under extreme conditions (for example, high temperature or high pressure). Here we report the complete phase transformation of Au square sheets (AuSSs) from hexagonal close-packed (hcp) to face-centered cubic (fcc) structures at ambient conditions via surface ligand exchange, resulting in the formation of (100)f-oriented fcc AuSSs. Importantly, the phase transformation can also be realized through the coating of a thin metal film (for example, Ag) on hcp AuSSs. Depending on the surfactants used during the metal coating process, two transformation pathways are observed, leading to the formation of (100)f-oriented fcc Au@Ag core-shell square sheets and (110)h/(101)f-oriented hcp/fcc mixed Au@Ag nanosheets. Furthermore, monochromated electron energy loss spectroscopy reveals the strong surface plasmon resonance absorption of fcc AuSS and Au@Ag square sheet in the infrared region. Our findings may offer a new route for the crystal-phase and shape-controlled synthesis of inorganic nanocrystals.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Hydrogen peroxide solution, contains inhibitor, 30 wt. % in H2O, meets USP testing specifications
Sigma-Aldrich
Hydrogen chloride solution, 1.0 M in diethyl ether
Sigma-Aldrich
Sulfuric acid, ACS reagent, 95.0-98.0%
Sigma-Aldrich
Hydrogen peroxide solution, contains inhibitor, 30 wt. % in H2O, ACS reagent
Sigma-Aldrich
Hydrochloric acid, ACS reagent, 37%
Sigma-Aldrich
Hydrochloric acid, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., fuming, ≥37%, APHA: ≤10
Sigma-Aldrich
Potassium permanganate, ACS reagent, ≥99.0%, low in mercury
Sigma-Aldrich
Hydrogen peroxide solution, 50 wt. % in H2O, stabilized
Sigma-Aldrich
Potassium permanganate, puriss. p.a., ACS reagent, Hg ≤0.000005%, ≥99.0% (RT)
Sigma-Aldrich
Hydrochloric acid, puriss., 24.5-26.0%
Sigma-Aldrich
Hydrochloric acid, meets analytical specification of Ph. Eur., BP, NF, fuming, 36.5-38%
Sigma-Aldrich
Sulfuric acid, puriss., meets analytical specification of Ph. Eur., BP, 95-97%
Sigma-Aldrich
Hydrogen Peroxide Solution, 30% (w/w), puriss. p.a., reag. ISO, reag. Ph. Eur.
Sigma-Aldrich
Hydrogen peroxide solution, purum p.a., ≥35% (RT)
Sigma-Aldrich
Sulfuric acid solution, puriss. p.a., ≥25% (T)
Sigma-Aldrich
Sulfuric acid, puriss. p.a., for determination of Hg, ACS reagent, reag. ISO, reag. Ph. Eur., 95.0-97.0%
Sigma-Aldrich
Potassium permanganate, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99%
Sigma-Aldrich
Hydrogen chloride solution, 1.0 M in acetic acid
Sigma-Aldrich
Hydrochloric acid, ACS reagent, 37%
Sigma-Aldrich
Potassium permanganate, ≤150 μm particle size, 97%
Sigma-Aldrich
Hydrochloric acid, 37 wt. % in H2O, 99.999% trace metals basis
Sigma-Aldrich
Potassium permanganate, ACS reagent, ≥99.0%
Sigma-Aldrich
Hydrogen chloride solution, 2.0 M in diethyl ether
Sigma-Aldrich
Hydrogen peroxide solution, contains inhibitor, 35 wt. % in H2O
Sigma-Aldrich
Hydrogen peroxide solution, contains ~200 ppm acetanilide as stabilizer, 3 wt. % in H2O
Sigma-Aldrich
Hydrogen chloride solution, 4.0 M in dioxane
Sigma-Aldrich
Hydrochloric acid, 36.5-38.0%, BioReagent, for molecular biology
Sigma-Aldrich
Sodium borohydride solution, 0.5 M in 2-methoxyethyl ether
Sigma-Aldrich
Sodium borohydride solution, ~12 wt. % in 14 M NaOH
Sigma-Aldrich
Hydrogen peroxide solution, contains potassium stannate as inhibitor, 30-32 wt. % in water, semiconductor grade, 99.999% trace metals basis