Preparation of amorphous and crystalline Ag/TiO2 nanocomposite thin films

Viana, Marcelo Machado; Mohallem, Nelcy Della Santina; Miquita, Douglas R.; Balzuweit, Karla; Silva-Pinto, Elisangela

doi:10.1016/j.apsusc.2012.10.151

Cited by 83 publications

(24 citation statements)

References 34 publications

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“…At 400 °C (Fig. 3 A 3 ), there is a slight decrease in the number of Ag aggregates, associated with an increase of the spherical definition of the Ag particles shape (becoming nearly spherical) [21][6], together with a slight increase in the aggregate's dimension on the surface [22,23]. Confirming this fact, it is visible at 500 °C ( Fig.…”

Section: Morphological and Structural Characterizationsupporting

confidence: 63%

Structural and Morphological Changes in Ag:TiN Nanocomposite Films Promoted by In-Vacuum Annealing

Machado

Pedrosa

Fonseca

et al. 2013

JNanoR

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Thin films composed of titanium nitride doped with silver were deposited by DC reactive sputtering, with Ag contents varying between 0 and 50 at.%. The as-deposited samples were subjected to vacuum annealing treatments, with a range of temperatures varying from 200 to 500°C, in order to study the morphological and structural changes that may occur. The as-deposited samples showed three main zones of basic characteristics, which differ both in terms of the morphology and structural features.With the increase of the annealing temperature, the thermodynamic stability was accelerated, revealing a phenomenon of dispersion of silver particles at 200 °C and the start of its segregation at 300 °C. At 400 °C, the coalescence of the segregated Ag particles begins, while at 500 °C the formation of large clusters of Ag is glaring, particularly in the samples with higher Ag content. In addition, and corroborating the * To whom all correspondence should be sent (fvaz@fisica.uminho.pt) 2 presence of free Ag in the thin films, the increase of the annealing temperature promotes coating's crystallinity and some Ag grain growth.

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Section: Morphological and Structural Characterizationsupporting

confidence: 63%

Structural and Morphological Changes in Ag:TiN Nanocomposite Films Promoted by In-Vacuum Annealing

Machado

Pedrosa

Fonseca

et al. 2013

JNanoR

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“…In addition, static contact angle measurement was carried out to study the wetability behavior of the as‐prepared samples (Figure e,f). The WO 3− x nanosheets displays significantly better hydrophilic than the exfoliated WS 2 nanosheets, which suggests the WO 3− x nanosheets can be well used for water splitting, as hydrophilic behavior can make the HER process work effectively . Moreover, the wetability of electrode materials can efficiently promote the surface electrochemical reaction through the enhancement of the contact with electrolyte.…”

Section: Resultsmentioning

confidence: 78%

Ultrathin, Porous and Oxygen Vacancies‐Enriched Ag/WO_3−x Heterostructures for Electrocatalytic Hydrogen Evolution

Ren

Chen

2019

Chemistry An Asian Journal

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Exploring advanced electrocatalysts for electrocatalytic hydrogen evolution is highly desired but remains a challenge due to the lack of an efficient preparation method and reasonable structural design. Herein, we deliberately designed novel Ag/WO3−x heterostructures through a supercritical CO2‐assisted exfoliation‐oxidation route and the subsequent loading of Ag nanoparticles. The ultrathin and oxygen vacancies‐enriched WO3−x nanosheets are ideal substrates for loading Ag nanoparticles, which can largely increase the active site density and improve electron transport. Besides, the resultant WO3−x nanosheets with porous structure can form during the electrochemical cycling process induced by an electric field. As a result, the exquisite Ag/WO3−x heterostructures show an enhanced hydrogen evolution reaction (HER) activity with a low onset overpotential of ≈30 mV, a small Tafel slope of ≈40 mV dec−1 at 10 mA cm−2, and as well as long‐term durability. This work sheds light on material design and preparation, and even opens up an avenue for the development of high‐efficiency electrocatalysts.

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“…The electrons can be scavenged by dissolved molecular oxygen in water to form O 2 ÀÅ and then on protonation to yield HOO Å . The HOO Å further traps electrons to produce H 2 O 2 and finally forms HO Å radicals [48]. These active species together with oxidative holes result in the degradation and mineralization of dyes.…”

Section: Photocatalytic Propertymentioning

confidence: 99%

Facile in-situ photocatalysis of Ag/Bi2WO6 heterostructure with obviously enhanced performance

Cui

Yang

et al. 2015

Separation and Purification Technology

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Preparation of amorphous and crystalline Ag/TiO2 nanocomposite thin films

Cited by 83 publications

References 34 publications

Structural and Morphological Changes in Ag:TiN Nanocomposite Films Promoted by In-Vacuum Annealing

Structural and Morphological Changes in Ag:TiN Nanocomposite Films Promoted by In-Vacuum Annealing

Ultrathin, Porous and Oxygen Vacancies‐Enriched Ag/WO_3−x Heterostructures for Electrocatalytic Hydrogen Evolution

Facile in-situ photocatalysis of Ag/Bi2WO6 heterostructure with obviously enhanced performance

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Preparation of amorphous and crystalline Ag/TiO2 nanocomposite thin films

Cited by 83 publications

References 34 publications

Structural and Morphological Changes in Ag:TiN Nanocomposite Films Promoted by In-Vacuum Annealing

Structural and Morphological Changes in Ag:TiN Nanocomposite Films Promoted by In-Vacuum Annealing

Ultrathin, Porous and Oxygen Vacancies‐Enriched Ag/WO3−x Heterostructures for Electrocatalytic Hydrogen Evolution

Facile in-situ photocatalysis of Ag/Bi2WO6 heterostructure with obviously enhanced performance

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Ultrathin, Porous and Oxygen Vacancies‐Enriched Ag/WO_3−x Heterostructures for Electrocatalytic Hydrogen Evolution