Ultrafast Photoacoustic Nanometrology of InAs Nanowires Mechanical Properties

Year: 2022

Authors: Gandolfi M.; Peli S.; Diego M.; Danesi S.; Giannetti C.; Alessandri I.; Zannier V.; Demontis V.; Rocci M.; Beltram F.; Sorba L.; Roddaro S.; Rossella F.; Banfi F.

Autors Affiliation: Univ Claude Bernard Lyon1, FemtoNanoOpt Grp, Univ Lyon, Inst Lumiere Matiere,CNRS, F-69622 Villeurbanne, France; INSTM UdR Brescia, I-25123 Brescia, Italy; Univ Brescia, Dept Mech & Ind Engn, I-25123 Brescia, Italy; Univ Cattolica Sacro Cuore, Interdisciplinary Labs Adv Mat Phys I LAMP, Brescia, Italy; Univ Cattolica Sacro Cuore, Dipartimento Matemat & Fis, Brescia, Italy; Univ Brescia, Dept Informat Engn, I-25123 Brescia, Italy; CNR INO, I-25123 Brescia, Italy; CNR, Ist Nanosci, NEST, I-56127 Pisa, Italy; Scuola Normale Super Pisa, I-56127 Pisa, Italy; Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy; Univ Modena & Reggio Emilia, Dipartimento Sci Fis Informat & Matemat, I-41125 Modena, Italy; Castellini Solut Castellini Officine Meccan, I-25046 Cazzago San Martino, BS, Italy

Abstract: InAs nanowires are emerging as go-to materials in a variety of applications ranging from optoelectronics to nanoelectronics, yet a consensus on their mechanical properties is still lacking. The mechanical properties of wurtzite InAs nanowires are here investigated via a mu ltitechnique approach, exploiting electron microscopies, ultrafast photoacoustics, and finite element simulations. A benchmarked elastic matrix is provided and a Young modulus of 97 GPa is obtained, thus clarifying the debated issue of InAs NW elastic properties. The validity of the analytical approaches and approximations commonly adopted to retrieve the elastic properties from ultrafast spectroscopies is discussed. The mechanism triggering the oscillations is unveiled. Nanowire oscillations in this system arise from a sudden expansion of the supporting substrate rather than the nanowire itself. This mechanism constitutes a new paradigm, being at variance with respect to the excitation mechanisms so far identified in ultrafast experiments on nanowires and on a plethora of nanosystems. The present findings are relevant in view of applications involving InAs nanowires, knowledge of their mechanical properties being crucial for any device engineering beyond a trial-and-error approach. The results bear generality beyond the specific case, the launching mechanism potentially encompassing a variety of systems serving as nano-optomechanical resonators.


Volume: 126 (14)      Pages from: 6361  to: 6372

More Information: We acknowledge D. Ercolani for the support in the analysis of length and diameter distributions and F. Rossi for the TEM analysis of the NW samples. M.G. acknowledges support from Universita Cattolica del Sacro Cuore in the frame of the international Ph.D. program. F. Banfi, F.R., and S.P. acknowledge financial support from the MIUR Futuro in ricerca 2013 Grant in the frame of the ULTRA-NANO Project (Project No. RBFR13NEA4). F. Banfi acknowledges financial support from CNRS through Delegation CNRS 2021-2022, Universite de Lyon in the frame of the IDEXLYON Project (ANR-16-IDEX0005) and from Universite Claude Bernard Lyon 1 through the BQR Accueil EC 2019 grant. S.R. acknowledges the financial support of the Italian Ministry of University and Research (PRIN Project QUANUTM2D) and of the Italian Ministry of Foreign Affairs (Project QUANTRA).
DOI: 10.1021/acs.jpcc.2c01060

Citations: 7
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