Novel issues of morphology, size, and structure of Pt nanoparticles in chemical engineering: Surface attachment, aggregation or agglomeration, assembly, and structural changes

Nguyen Viet Long, Cao Minh Thi, Masayuki Nogami, Michitaka Ohtaki

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

In this paper, the polyhedral Pt nanoparticles were prepared by a modified polyol method using AgNO 3 as a nanostructure-shaping agent. TEM and HRTEM images of Pt nanoparticles show the particle size in the 10 nm range for the well-controlled case. In contrast, Pt nanoparticles have the particle size in the 50 nm range for the uncontrolled case. To understand the important issues of morphology, size, surface and structure, the as-prepared Pt nanoparticles were investigated through UV-vis spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution (HR)TEM measurements. In the two cases, the as-prepared Pt nanoparticles with and without the control procedures exhibit surface attachment, aggregation or agglomeration and assembly. The mechanisms can lead to the formation of the ultra-porous mesostructure of the as-prepared Pt nanoparticles by using various sophisticated control methods. Therefore, the experimental findings and observations showed the formations of the porous Pt nanostructures as the new Pt textures from self-aggregation or self-agglomeration and self-assembly of extreme importance in designing great superlattices under experimentally chemical and physical methods. This also proved the important role of PVP polymer in the protection of the as-prepared nanoparticles. In particular, a new phenomenon was found in the randomly natural collapse and self-breaking in the Pt nanostructures originating from the naked Pt nanoparticles without protective polymer agents. As a result, a porous meso-nanostructure was formed by the structural changes of Pt nanoparticles without stabilization of the PVP polymer. Finally, the discoveries of surface structure changes of polyhedral Pt shapes and morphologies in future are very important in further catalysis investigation.

Original languageEnglish
Pages (from-to)1320-1334
Number of pages15
JournalNew Journal of Chemistry
Volume36
Issue number6
DOIs
Publication statusPublished - Jun 1 2012
Externally publishedYes

Fingerprint

Chemical engineering
Agglomeration
Nanoparticles
Nanostructures
Polymers
Particle size
Transmission electron microscopy
Polyols
Superlattices
High resolution transmission electron microscopy
Ultraviolet spectroscopy
Surface structure
Self assembly
Catalysis
Stabilization
Textures
X ray diffraction

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry

Cite this

Novel issues of morphology, size, and structure of Pt nanoparticles in chemical engineering : Surface attachment, aggregation or agglomeration, assembly, and structural changes. / Long, Nguyen Viet; Thi, Cao Minh; Nogami, Masayuki; Ohtaki, Michitaka.

In: New Journal of Chemistry, Vol. 36, No. 6, 01.06.2012, p. 1320-1334.

Research output: Contribution to journalArticle

@article{c7b6ca64ec4e47389ed4c029ae3daea2,
title = "Novel issues of morphology, size, and structure of Pt nanoparticles in chemical engineering: Surface attachment, aggregation or agglomeration, assembly, and structural changes",
abstract = "In this paper, the polyhedral Pt nanoparticles were prepared by a modified polyol method using AgNO 3 as a nanostructure-shaping agent. TEM and HRTEM images of Pt nanoparticles show the particle size in the 10 nm range for the well-controlled case. In contrast, Pt nanoparticles have the particle size in the 50 nm range for the uncontrolled case. To understand the important issues of morphology, size, surface and structure, the as-prepared Pt nanoparticles were investigated through UV-vis spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution (HR)TEM measurements. In the two cases, the as-prepared Pt nanoparticles with and without the control procedures exhibit surface attachment, aggregation or agglomeration and assembly. The mechanisms can lead to the formation of the ultra-porous mesostructure of the as-prepared Pt nanoparticles by using various sophisticated control methods. Therefore, the experimental findings and observations showed the formations of the porous Pt nanostructures as the new Pt textures from self-aggregation or self-agglomeration and self-assembly of extreme importance in designing great superlattices under experimentally chemical and physical methods. This also proved the important role of PVP polymer in the protection of the as-prepared nanoparticles. In particular, a new phenomenon was found in the randomly natural collapse and self-breaking in the Pt nanostructures originating from the naked Pt nanoparticles without protective polymer agents. As a result, a porous meso-nanostructure was formed by the structural changes of Pt nanoparticles without stabilization of the PVP polymer. Finally, the discoveries of surface structure changes of polyhedral Pt shapes and morphologies in future are very important in further catalysis investigation.",
author = "Long, {Nguyen Viet} and Thi, {Cao Minh} and Masayuki Nogami and Michitaka Ohtaki",
year = "2012",
month = "6",
day = "1",
doi = "10.1039/c2nj40027h",
language = "English",
volume = "36",
pages = "1320--1334",
journal = "New Journal of Chemistry",
issn = "1144-0546",
publisher = "Royal Society of Chemistry",
number = "6",

}

TY - JOUR

T1 - Novel issues of morphology, size, and structure of Pt nanoparticles in chemical engineering

T2 - Surface attachment, aggregation or agglomeration, assembly, and structural changes

AU - Long, Nguyen Viet

AU - Thi, Cao Minh

AU - Nogami, Masayuki

AU - Ohtaki, Michitaka

PY - 2012/6/1

Y1 - 2012/6/1

N2 - In this paper, the polyhedral Pt nanoparticles were prepared by a modified polyol method using AgNO 3 as a nanostructure-shaping agent. TEM and HRTEM images of Pt nanoparticles show the particle size in the 10 nm range for the well-controlled case. In contrast, Pt nanoparticles have the particle size in the 50 nm range for the uncontrolled case. To understand the important issues of morphology, size, surface and structure, the as-prepared Pt nanoparticles were investigated through UV-vis spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution (HR)TEM measurements. In the two cases, the as-prepared Pt nanoparticles with and without the control procedures exhibit surface attachment, aggregation or agglomeration and assembly. The mechanisms can lead to the formation of the ultra-porous mesostructure of the as-prepared Pt nanoparticles by using various sophisticated control methods. Therefore, the experimental findings and observations showed the formations of the porous Pt nanostructures as the new Pt textures from self-aggregation or self-agglomeration and self-assembly of extreme importance in designing great superlattices under experimentally chemical and physical methods. This also proved the important role of PVP polymer in the protection of the as-prepared nanoparticles. In particular, a new phenomenon was found in the randomly natural collapse and self-breaking in the Pt nanostructures originating from the naked Pt nanoparticles without protective polymer agents. As a result, a porous meso-nanostructure was formed by the structural changes of Pt nanoparticles without stabilization of the PVP polymer. Finally, the discoveries of surface structure changes of polyhedral Pt shapes and morphologies in future are very important in further catalysis investigation.

AB - In this paper, the polyhedral Pt nanoparticles were prepared by a modified polyol method using AgNO 3 as a nanostructure-shaping agent. TEM and HRTEM images of Pt nanoparticles show the particle size in the 10 nm range for the well-controlled case. In contrast, Pt nanoparticles have the particle size in the 50 nm range for the uncontrolled case. To understand the important issues of morphology, size, surface and structure, the as-prepared Pt nanoparticles were investigated through UV-vis spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution (HR)TEM measurements. In the two cases, the as-prepared Pt nanoparticles with and without the control procedures exhibit surface attachment, aggregation or agglomeration and assembly. The mechanisms can lead to the formation of the ultra-porous mesostructure of the as-prepared Pt nanoparticles by using various sophisticated control methods. Therefore, the experimental findings and observations showed the formations of the porous Pt nanostructures as the new Pt textures from self-aggregation or self-agglomeration and self-assembly of extreme importance in designing great superlattices under experimentally chemical and physical methods. This also proved the important role of PVP polymer in the protection of the as-prepared nanoparticles. In particular, a new phenomenon was found in the randomly natural collapse and self-breaking in the Pt nanostructures originating from the naked Pt nanoparticles without protective polymer agents. As a result, a porous meso-nanostructure was formed by the structural changes of Pt nanoparticles without stabilization of the PVP polymer. Finally, the discoveries of surface structure changes of polyhedral Pt shapes and morphologies in future are very important in further catalysis investigation.

UR - http://www.scopus.com/inward/record.url?scp=84865659149&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84865659149&partnerID=8YFLogxK

U2 - 10.1039/c2nj40027h

DO - 10.1039/c2nj40027h

M3 - Article

AN - SCOPUS:84865659149

VL - 36

SP - 1320

EP - 1334

JO - New Journal of Chemistry

JF - New Journal of Chemistry

SN - 1144-0546

IS - 6

ER -