Stepwise Evolution of Spherical Seeds into 20-Fold Twinned Icosahedra

Abstract

Understanding the factors that influence the growth and final shape of noble metal nanostructures is important for controlling their properties. However, relative to their single-crystalline counterparts, the growth of nanoparticles that contain twin defects can be difficult to control because multiple competitive growth pathways can yield such structures. We used spherical, cubic, and octahedral single-crystalline gold nanoparticles as dual electron microscopy labels and plasmonic seeds to track the growth of multiply twinned silver nanostructures. As the bimetallic nanostructures grew, they successively developed twin planes to ultimately form multiply twinned nanoparticles from single-crystalline seeds. Collectively, these data demonstrate how a series of nanoparticles of different shapes and internal crystal structures are interrelated and develop from one another.

Packing and self-assembly of truncated triangular bipyramids

“…The phases expected for such colloidal systems can be predicted through theoretical and computational studies of the corresponding hard particle system. Recent breakthroughs in the synthesis of colloidal particles of various shapes [11][12][13][14][15][16][17][18][19][20][21][22][23] have spurred an increased interest in studies of hard particle systems.…”

Plasmonische Synthese von metallischen Nanostrukturen

“…Demnach kçnnen offensichtlich auch Strukturdefekte zur Bildung der Tetraeder beitragen (siehe Abschnitt 7). [196] Bei den oben beschriebenen plasmonischen Synthesen, die mit hoher Ausbeute zu Ag-Dekaedern führen, wird eine Lçsung aus Ag-Keimen, die eine Mischung von Zwillingsstrukturen enthalten, mit kurzwelligem Licht bestrahlt. [197] Unter kinetischer Kontrolle und bei langsamen Reaktionsbedingungen wird Ag + bevorzugt an den energiereichsten, d. h. reaktivsten Oberflächen abgeschieden.…”

“…Mit dieser Strategie wurden bei plasmonischen Reaktionen bereits die Kenntnisse über die Rollen von Anregungswellenlänge [138] und pH-Wert [161] vertieft und der Effekt von Verzwillingungen auf das Partikelwachstum ergründet. [196] Um die Reaktionen mit Au-Keimen durchführen zu kçnnen, muss lediglich am Anfang die Anregungwellenlänge auf die Plasmonenresonanz der Au-Keime eingestellt werden. Dies stellt sicher, dass die Abscheidung bevorzugt auf die AuPartikel stattfindet.…”

Review Article: Case studies in future trends of computational and experimental nanomechanics

“…Rather, it was found that GBs act as sinks and sources of dislocations at flow stress larger than 0.5 GPa. 152 Hence, in nano-objects, GBs do not act as a significant barrier to dislocation glide. Indeed, the GB hardening effect associated with the decrease in the dislocation mean free path is counteracted by a new role of the GBs, which act as additional sites of dislocation nucleation in the crystal.…”

“…151,152 Thus, the influence in the experiment of twin boundaries (TBs) or GBs has only been postulated from tests made with bicrystalline micro-or nanopillars built from FIB machining. [153][154][155] Interestingly, it was shown that the presence of an interface in a metallic micropillar does not affect strongly the mechanical properties.…”