Controlled Growth of Platinum Nanoparticles on Strontium Titanate Nanocubes by Atomic Layer Deposition

Abstract

With an eye toward using surface morphology to enhance heterogeneous catalysis, Pt nanoparticles are grown by atomic layer deposition (ALD) on the surfaces of SrTiO(3) nanocubes. The size, dispersion, and chemical state of the Pt nanoparticles are controlled by the number of ALD growth cycles. The SrTiO(3) nanocubes average 60 nm on a side with {001} faces. The Pt loading increases linearly with Pt ALD cycles to a value of 1.1 x 10(-6) g cm(-2) after five cycles. Scanning electron microscopy images reveal discrete, well-dispersed Pt nanoparticles. Small- and wide-angle X-ray scattering show that the Pt nanoparticle spacing and size increase as the number of ALD cycles increases. X-ray absorption spectroscopy shows a progression from platinum(II) oxide to metallic platinum and a decrease in Pt--O bonding with an increase in Pt--Pt bonding as the number of ALD cycles increases.

A nanostructured cathode architecture for low charge overpotential in lithium-oxygen batteries

“…One of the distinguishing attributes of ALD is the capability to deposit coatings on surfaces with complex topographies and to infiltrate mesoporous materials, important for the Al 2 O 3 coatings used for the cathode in this study [28][29][30] . The ALD technique can also be used to synthesize supported noble metal catalysts, such as Pd used in this work, in the size range from subnanometres to nanometres [31][32][33][34] .…”

In situ synchrotron based x-ray techniques as monitoring tools for atomic layer deposition

“…[70][71][72] There are also reports of XAS as an in vacuo technique, where the sample can be transferred from the ALD chamber to an UHV system to allow for XAS. [36][37][38][39] To the best of our knowledge, the use of XAS as an in situ technique has been performed once on powderous supports in absorption mode 40 and once studying ALD growth on a planar support in fluorescence mode.…”

A highly active, stable and synergistic Pt nanoparticles/Mo2C nanotube catalyst for methanol electro-oxidation

“…13,14 To this end, atomic layer deposition (ALD) is an attractive technique to deposit such thin films or nanosized catalysts because of its merits of simplicity, reproducibility and conformality. [15][16][17][18] Another effective strategy to improve the catalytic activity of the noble metal-based catalyst is using suitable catalyst promoter. [19][20][21] The addition of carbide could lead to a highly promotive effect on noble metal-based electrocatalysts, [22][23][24][25][26][27] which has been described as synergistic effects.…”