Synthesis, characterization, and thermal stability of SiO2/TiO2/CR-Ag multilayered nanostructures

Gabriela Díaz, Yao Jen Chang, Ara Philipossian

Research output: Contribution to journalArticle

Abstract

The controllable synthesis and characterization of novel thermally stable silver-based particles are described. The experimental approach involves the design of thermally stable nanostructures by the deposition of an interfacial thick, active titania layer between the primary substrate (SiO2 particles) and the metal nanoparticles (Ag NPs), as well as the doping of Ag nanoparticles with an organic molecule (Congo Red, CR). The nanostructured particles were composed of a 330-nm silica core capped by a granular titania layer (10 to 13 nm in thickness), along with monodisperse 5 to 30 nm CR-Ag NPs deposited on top. The titania-coated support (SiO2/TiO2 particles) was shown to be chemically and thermally stable and promoted the nucleation and anchoring of CR-Ag NPs, which prevented the sintering of CR-Ag NPs when the structure was exposed to high temperatures. The thermal stability of the silver composites was examined by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). Larger than 10 nm CR-Ag NPs were thermally stable up to 300 °C. Such temperature was high enough to destabilize the CR-Ag NPs due to the melting point of the CR. On the other hand, smaller than 10 nm Ag NPs were stable at temperatures up to 500 °C because of the strong metal-metal oxide binding energy. Energy dispersion X-ray spectroscopy (EDS) was carried out to qualitatively analyze the chemical stability of the structure at different temperatures which confirmed the stability of the structure and the existence of silver NPs at temperatures up to 500 °C.

Original languageEnglish (US)
Article number157
JournalJournal of Nanoparticle Research
Volume20
Issue number6
DOIs
StatePublished - Jun 1 2018

Fingerprint

Congo Red
Thermal Stability
TiO2
SiO2
Nanostructures
Thermodynamic stability
thermal stability
Synthesis
Titanium
Silver
titanium
silver
synthesis
nanoparticles
Temperature
Metals
Metal Nanoparticles
metals
X-ray Spectroscopy
Sintering

Keywords

  • Ag nanoparticles
  • Electron microscopy
  • Nanocomposites
  • Nanostructures
  • Sintering
  • Thermal stability

ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Synthesis, characterization, and thermal stability of SiO2/TiO2/CR-Ag multilayered nanostructures. / Díaz, Gabriela; Chang, Yao Jen; Philipossian, Ara.

In: Journal of Nanoparticle Research, Vol. 20, No. 6, 157, 01.06.2018.

Research output: Contribution to journalArticle

@article{8b937bf76892498aa79f17dcfcca7353,
title = "Synthesis, characterization, and thermal stability of SiO2/TiO2/CR-Ag multilayered nanostructures",
abstract = "The controllable synthesis and characterization of novel thermally stable silver-based particles are described. The experimental approach involves the design of thermally stable nanostructures by the deposition of an interfacial thick, active titania layer between the primary substrate (SiO2 particles) and the metal nanoparticles (Ag NPs), as well as the doping of Ag nanoparticles with an organic molecule (Congo Red, CR). The nanostructured particles were composed of a 330-nm silica core capped by a granular titania layer (10 to 13 nm in thickness), along with monodisperse 5 to 30 nm CR-Ag NPs deposited on top. The titania-coated support (SiO2/TiO2 particles) was shown to be chemically and thermally stable and promoted the nucleation and anchoring of CR-Ag NPs, which prevented the sintering of CR-Ag NPs when the structure was exposed to high temperatures. The thermal stability of the silver composites was examined by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). Larger than 10 nm CR-Ag NPs were thermally stable up to 300 °C. Such temperature was high enough to destabilize the CR-Ag NPs due to the melting point of the CR. On the other hand, smaller than 10 nm Ag NPs were stable at temperatures up to 500 °C because of the strong metal-metal oxide binding energy. Energy dispersion X-ray spectroscopy (EDS) was carried out to qualitatively analyze the chemical stability of the structure at different temperatures which confirmed the stability of the structure and the existence of silver NPs at temperatures up to 500 °C.",
keywords = "Ag nanoparticles, Electron microscopy, Nanocomposites, Nanostructures, Sintering, Thermal stability",
author = "Gabriela D{\'i}az and Chang, {Yao Jen} and Ara Philipossian",
year = "2018",
month = "6",
day = "1",
doi = "10.1007/s11051-018-4260-0",
language = "English (US)",
volume = "20",
journal = "Journal of Nanoparticle Research",
issn = "1388-0764",
publisher = "Springer Netherlands",
number = "6",

}

TY - JOUR

T1 - Synthesis, characterization, and thermal stability of SiO2/TiO2/CR-Ag multilayered nanostructures

AU - Díaz, Gabriela

AU - Chang, Yao Jen

AU - Philipossian, Ara

PY - 2018/6/1

Y1 - 2018/6/1

N2 - The controllable synthesis and characterization of novel thermally stable silver-based particles are described. The experimental approach involves the design of thermally stable nanostructures by the deposition of an interfacial thick, active titania layer between the primary substrate (SiO2 particles) and the metal nanoparticles (Ag NPs), as well as the doping of Ag nanoparticles with an organic molecule (Congo Red, CR). The nanostructured particles were composed of a 330-nm silica core capped by a granular titania layer (10 to 13 nm in thickness), along with monodisperse 5 to 30 nm CR-Ag NPs deposited on top. The titania-coated support (SiO2/TiO2 particles) was shown to be chemically and thermally stable and promoted the nucleation and anchoring of CR-Ag NPs, which prevented the sintering of CR-Ag NPs when the structure was exposed to high temperatures. The thermal stability of the silver composites was examined by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). Larger than 10 nm CR-Ag NPs were thermally stable up to 300 °C. Such temperature was high enough to destabilize the CR-Ag NPs due to the melting point of the CR. On the other hand, smaller than 10 nm Ag NPs were stable at temperatures up to 500 °C because of the strong metal-metal oxide binding energy. Energy dispersion X-ray spectroscopy (EDS) was carried out to qualitatively analyze the chemical stability of the structure at different temperatures which confirmed the stability of the structure and the existence of silver NPs at temperatures up to 500 °C.

AB - The controllable synthesis and characterization of novel thermally stable silver-based particles are described. The experimental approach involves the design of thermally stable nanostructures by the deposition of an interfacial thick, active titania layer between the primary substrate (SiO2 particles) and the metal nanoparticles (Ag NPs), as well as the doping of Ag nanoparticles with an organic molecule (Congo Red, CR). The nanostructured particles were composed of a 330-nm silica core capped by a granular titania layer (10 to 13 nm in thickness), along with monodisperse 5 to 30 nm CR-Ag NPs deposited on top. The titania-coated support (SiO2/TiO2 particles) was shown to be chemically and thermally stable and promoted the nucleation and anchoring of CR-Ag NPs, which prevented the sintering of CR-Ag NPs when the structure was exposed to high temperatures. The thermal stability of the silver composites was examined by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). Larger than 10 nm CR-Ag NPs were thermally stable up to 300 °C. Such temperature was high enough to destabilize the CR-Ag NPs due to the melting point of the CR. On the other hand, smaller than 10 nm Ag NPs were stable at temperatures up to 500 °C because of the strong metal-metal oxide binding energy. Energy dispersion X-ray spectroscopy (EDS) was carried out to qualitatively analyze the chemical stability of the structure at different temperatures which confirmed the stability of the structure and the existence of silver NPs at temperatures up to 500 °C.

KW - Ag nanoparticles

KW - Electron microscopy

KW - Nanocomposites

KW - Nanostructures

KW - Sintering

KW - Thermal stability

UR - http://www.scopus.com/inward/record.url?scp=85048172517&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85048172517&partnerID=8YFLogxK

U2 - 10.1007/s11051-018-4260-0

DO - 10.1007/s11051-018-4260-0

M3 - Article

VL - 20

JO - Journal of Nanoparticle Research

JF - Journal of Nanoparticle Research

SN - 1388-0764

IS - 6

M1 - 157

ER -