Influence of iodide ions on morphology of silver growth on gold hexagonal nanoplates

Jungah Kim; Soonchang Hong; Hee Jeong Jang; Yoonjung Choi; Sungho Park

doi:10.1016/j.jcis.2012.09.007

Influence of iodide ions on morphology of silver growth on gold hexagonal nanoplates

Jungah Kim
, Soonchang Hong
, Hee Jeong Jang
, Yoonjung Choi
, Sungho Park

Department of Radiology

Sungkyunkwan University

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

Different morphologies of Au@Ag nanocrystals have been successfully synthesized using iodide ions in growth solutions consisting of ascorbic acid, NaOH, and CTAB. Without I ^- ions in growth solution, there were unnoticeable changes in morphology. On the other hand, with addition of I ^- ions, remarkable changes were observed including formation of hexagonal bipyramidal nanocrystals. Ag ⁺ ions were reduced and deposited on {111} facets of gold hexagonal nanoplates (GHNs), and hexagonal bipyramidal nanoparticles were formed more quickly in the presence of I ^- ions than without I ^- ions. Our studies reveal that I ^- ion affects the selective growth of Ag onto GHNs. This can be explained by the decrease in the surface redox potential of nanocrystals that occurs by combining with the AgI complex on the metallic surface. These results were confirmed by FESEM images, UV-vis-NIR spectra, and TEM images.

Original language	English
Pages (from-to)	71-76
Number of pages	6
Journal	Journal of Colloid and Interface Science
Volume	389
Issue number	1
DOIs	https://doi.org/10.1016/j.jcis.2012.09.007
State	Published - 1 Jan 2013

Keywords

Ag growth
Au@Ag core-shell nanocrystals
Gold hexagonal nanoplates (GHNs)
Hexagonal bipyramid
Iodide ion (I )
Morphology

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10.1016/j.jcis.2012.09.007

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title = "Influence of iodide ions on morphology of silver growth on gold hexagonal nanoplates",

abstract = "Different morphologies of Au@Ag nanocrystals have been successfully synthesized using iodide ions in growth solutions consisting of ascorbic acid, NaOH, and CTAB. Without I - ions in growth solution, there were unnoticeable changes in morphology. On the other hand, with addition of I - ions, remarkable changes were observed including formation of hexagonal bipyramidal nanocrystals. Ag + ions were reduced and deposited on \{111\} facets of gold hexagonal nanoplates (GHNs), and hexagonal bipyramidal nanoparticles were formed more quickly in the presence of I - ions than without I - ions. Our studies reveal that I - ion affects the selective growth of Ag onto GHNs. This can be explained by the decrease in the surface redox potential of nanocrystals that occurs by combining with the AgI complex on the metallic surface. These results were confirmed by FESEM images, UV-vis-NIR spectra, and TEM images.",

keywords = "Ag growth, Au@Ag core-shell nanocrystals, Gold hexagonal nanoplates (GHNs), Hexagonal bipyramid, Iodide ion (I ), Morphology",

author = "Jungah Kim and Soonchang Hong and Jang, \{Hee Jeong\} and Yoonjung Choi and Sungho Park",

year = "2013",

month = jan,

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doi = "10.1016/j.jcis.2012.09.007",

language = "English",

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journal = "Journal of Colloid and Interface Science",

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T1 - Influence of iodide ions on morphology of silver growth on gold hexagonal nanoplates

AU - Kim, Jungah

AU - Hong, Soonchang

AU - Jang, Hee Jeong

AU - Choi, Yoonjung

AU - Park, Sungho

PY - 2013/1/1

Y1 - 2013/1/1

N2 - Different morphologies of Au@Ag nanocrystals have been successfully synthesized using iodide ions in growth solutions consisting of ascorbic acid, NaOH, and CTAB. Without I - ions in growth solution, there were unnoticeable changes in morphology. On the other hand, with addition of I - ions, remarkable changes were observed including formation of hexagonal bipyramidal nanocrystals. Ag + ions were reduced and deposited on {111} facets of gold hexagonal nanoplates (GHNs), and hexagonal bipyramidal nanoparticles were formed more quickly in the presence of I - ions than without I - ions. Our studies reveal that I - ion affects the selective growth of Ag onto GHNs. This can be explained by the decrease in the surface redox potential of nanocrystals that occurs by combining with the AgI complex on the metallic surface. These results were confirmed by FESEM images, UV-vis-NIR spectra, and TEM images.

AB - Different morphologies of Au@Ag nanocrystals have been successfully synthesized using iodide ions in growth solutions consisting of ascorbic acid, NaOH, and CTAB. Without I - ions in growth solution, there were unnoticeable changes in morphology. On the other hand, with addition of I - ions, remarkable changes were observed including formation of hexagonal bipyramidal nanocrystals. Ag + ions were reduced and deposited on {111} facets of gold hexagonal nanoplates (GHNs), and hexagonal bipyramidal nanoparticles were formed more quickly in the presence of I - ions than without I - ions. Our studies reveal that I - ion affects the selective growth of Ag onto GHNs. This can be explained by the decrease in the surface redox potential of nanocrystals that occurs by combining with the AgI complex on the metallic surface. These results were confirmed by FESEM images, UV-vis-NIR spectra, and TEM images.

KW - Ag growth

KW - Au@Ag core-shell nanocrystals

KW - Gold hexagonal nanoplates (GHNs)

KW - Hexagonal bipyramid

KW - Iodide ion (I )

KW - Morphology

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DO - 10.1016/j.jcis.2012.09.007

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AN - SCOPUS:84867902859

SN - 0021-9797

VL - 389

SP - 71

EP - 76

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

IS - 1

ER -

Influence of iodide ions on morphology of silver growth on gold hexagonal nanoplates

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Keywords

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