Alberto Leonardi

Dr. Alberto Leonardi

orcid

Research Focus & Metrics

Academic Career Length

16Years (2011-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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18 October 2022 in ACS Nano
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Journal Article
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SBSandra L. A. Bueno
Sandra L. A. Bueno
Alberto LeonardiAlberto Leonardi
Alberto Leonardi
NKNabojit Kar
Nabojit Kar
KCKaustav Chatterjee
Kaustav Chatterjee
XZXun Zhan
Xun Zhan
SSSara E. Skrabalak
Sara E. Skrabalak

2 March 2020 in Nanoscale Advances
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Journal Article
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JGJocelyn T. L. Gamler
Jocelyn T. L. Gamler
Alberto LeonardiAlberto Leonardi
Alberto Leonardi
XSXiahan Sang
Xiahan Sang
KKKallum M. Koczkur
Kallum M. Koczkur
RURaymond Unocic
Raymond Unocic
SSSara E. Skrabalak
Sara E. Skrabalak
Bimetallic nanocrystals with a core@shell architecture are versatile, multifunctional particles. The lattice mismatch between core and shell regions induces strain, affecting the electronic properties of the shell metal, which is important for applications in catalysis. Here, we analyze this strain in core@shell nanocubes as a function of lattice mismatch and shell thickness. Coupling geometric phase analysis from atomic resolution scanning transmission electron microscopy images with molecular dynamics simulations reveals lattice relaxation in the shell within only a few monolayers and an overexpansion in the axial direction. Interestingly, many works report core@shell metal nanocatalysts with optimum performance at greater shell thicknesses. Our findings suggest that not strain alone but secondary factors, such as structural defects or structural changes in operando, may account for observed enhancements in some strain-engineered nanocatalysts; e.g., Rh@Pt nanocubes for formic acid electrooxidation.

16 June 2020 in Nature Communications
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LCLei Chen
Lei Chen
Alberto LeonardiAlberto Leonardi
Alberto Leonardi
JCJun Chen
Jun Chen
MCMuhan Cao
Muhan Cao
NLNa Li
Na Li
Xingchen YeXingchen Ye
Xingchen Ye
Chemical design of multicomponent nanocrystals requires atomic-level understanding of reaction kinetics. Here, we apply single-particle imaging coupled with atomistic simulation to study reaction pathways and rates of Pd@Au and Cu@Au core-shell nanocubes undergoing oxidative dissolution. Quantitative analysis of etching kinetics using in situ transmission electron microscopy (TEM) imaging reveals that the dissolution mechanism changes from predominantly edge-selective to layer-by-layer removal of Au atoms as the reaction progresses. Dissolution of the Au shell slows down when both metals are exposed, which we attribute to galvanic corrosion protection. Morphological transformations are determined by intrinsic anisotropy due to coordination-number-dependent atom removal rates and extrinsic anisotropy induced by the graphene window. Our work demonstrates that bimetallic core-shell nanocrystals are excellent probes for the local physicochemical conditions inside TEM liquid cells. Furthermore, single-particle TEM imaging and atomistic simulation of reaction trajectories can inform future design strategies for compositionally and architecturally sophisticated nanocrystals.

14 April 2015 in Physical Review B
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Paolo ScardiPaolo Scardi
Paolo Scardi
Alberto LeonardiAlberto Leonardi
Alberto Leonardi
LGLuca Gelisio
Luca Gelisio
MSM. R. Suchomel
M. R. Suchomel
BSB. T. Sneed
B. T. Sneed
CTC.-K. Tsung
C.-K. Tsung
Nearly identical Pd nanocubes yield an x-ray powder diffraction pattern with interference fringes affording access to unprecedented structural details of nanocrystal size, shape, and complex atomic displacement for a billion-sized population. The excellent agreement between diffraction data and molecular dynamics (MD) provides strong experimental validation of MD simulations and the proposed data-interpretation paradigm. These results show that individual atomic displacements within the nanocubes are not only a function of disrupted bonds and the crystallographic plane of the adjacent surface, but are complex strain gradients extending across all surfaces of the particle strongly influenced by atomic displacements. This observation of nonuniform surface strain and the manner in which it is affected by different sizes, shapes, and locations within each facet could be the key to understanding many surface related properties of shaped nanocrystals including those associated with important catalysis applications.

8 April 2019 in ACS Nano
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Journal Article
Closed access
JGJocelyn T. L. Gamler
Jocelyn T. L. Gamler
Alberto LeonardiAlberto Leonardi
Alberto Leonardi
HAHannah M. Ashberry
Hannah M. Ashberry
NDNicholas N. Daanen
Nicholas N. Daanen
YLYaroslav Losovyj
Yaroslav Losovyj
SSSara E. Skrabalak
Sara E. Skrabalak

8 November 2012 in Journal of Applied Crystallography
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Journal Article
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Alberto LeonardiAlberto Leonardi
Alberto Leonardi
MLMatteo Leoni
Matteo Leoni
SSStefano Siboni
Stefano Siboni
Paolo ScardiPaolo Scardi
Paolo Scardi