Syntheses of Ag–Au and Ag–Pd alloy triangular hollow nanoframes by galvanic replacement reactions without and with post-treatment using NaCl in an aqueous solution
Masaharu Tsuji,* a,b,c Takafumi Kidera,b Atsuhiko Yajima,c Mika Hamasaki,d Masashi Hattori,aTakeshi Tsuji a,b and Hirofumi Kawazumid
a Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga 816-8580, Japan. Fax: +81-092-583-7815; Tel.: +81-092-583-7815; E-mail:[email protected]
b Department of Applied Science for Electronics and Materials, Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
c Department of Automotive Science, Graduate School of Integrated Frontier Sciences, Kyushu University, Kasuga, 816-8580, Japan
d Department of Biological and Environmental Chemistry, School of Humanity-oriented Science and Technology, Kinki University, Iizuka 820-8555, Japan
*To whom correspondence should be addressed: E-mail: [email protected]
Fig. S1 Ag prisms prepared by AgNO3/NaBH4/PVP/Na3CA/H2O2 solution at reaction time of 30 min.
20 nm
S2
Fig. S2 (a) TEM, (b)-(e) TEM-EDS, and (f) line analysis data of Ag-Au alloys involving Cl component. The sample was obtained at Au/Ag molar ratio of 0.3.
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AuAgCl
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(a) TEM (b) Au component
(c) Ag component (d) Cl component
(e) Au, Ag, and Clcomponents
(f) Line analysis along a blue line in (a)
100 nm
S3
Fig. S3 (a) SAED pattern of a typical Ag triangular prism shown by a red circle of TEM image (b). This nanoparticle was prepared from AgNO3NaBH4PVPNa3CAH2O2solution at reaction time of 30 min.
{220}1/3{422}
(a) SAED (b) TEM
50 nm
S4
Fig. S4 XRD patterns of (a) Ag prisms and (b) Ag-Au alloy frames. Two peaks shown by red arrows arise from a hcp arrangement of Ag atoms. Ag prisms and Ag-Au frames were prepared using the same conditions as those in Fig. 1 and 2.
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{200}{220} {311}
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(a) Ag prisms
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nsity
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. Uni
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AgCl {200}
Ag-Au {111}
{200}
{220}{311}
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(b) Ag-Au frames
hcp peaks
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Fig. S5 Schematic of a nanoprism with a defect-induced hcp layer sandwiched between two fcc layers of unequal thicknesses.
S6
{111}
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nsity
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(b) Ag-Pd nanoframesafter NaCl treatment
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nsity
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(a) Ag-Pd nanoprismsbefore NaCl treatment
Ag-Pd{111}
Fig. S6 XRD patterns of Ag-Pd nanoprisms and nanoframes (a) before and (b) after NaCltreatment. Ag-Pd nanoprisms were prepared using the same condition as that in Fig. 6. Two peaks shown by red arrows arise from a hcp arrangement of Ag atoms. Blue dots lines in (b) are AgCl peaks.
hcp peaks
S7
{220}
{311}
Ag-Pd {111}
Fig. S7 (a) time-dependent evolution of UV-Vis-NIR spectra of Ag prisms after addition of saturated NaCl solution and TEM images of Ag prisms (b) before and (c) after NaCl treatment.
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(b) Before NaCl after treatment (c) After NaCl after treatment
