Heterostructures Built through Site‐Selective Deposition on Anisotropic Plasmonic Metal Nanocrystals and Their Applications

Abstract

Figure 2. TEM images of various types of anisotropic heterostructures. a) Au NRs with Ag preferentially deposited at the ends. Reproduced with permission. [43] Copyright 2014, American Chemical Society. b) Pd-tipped Au NRs. Reproduced with permission. [51] Copyright 2018, Wiley-VCH. c) Pt-tipped Au NRs. Reproduced with permission. [45] Copyright 2014, American Chemical Society. d) Dumbbell-like PtFe-tipped Au NRs. Reproduced with permission. [54] Copyright 2018, Royal Society of Chemistry. e) Au NRs with TiO 2 deposited at the ends. Reproduced with permission. [69] Copyright 2018, Wiley-VCH. f ) Au NRs with CeO 2 deposited at the rod ends. A high-angle-annular dark-field scanning TEM (HAADFÀSTEM) image is shown. Reproduced with permission. [19] Copyright 2019, American Chemical Society. g) HOH Au NCs with Cu 2 O deposited at their vertexes. Reproduced with permission. [70] Copyright 2016, American Chemical Society. h) Au triangular nanoplates (TNPs) with Ag 2 S deposited at the edges and vertexes. Reproduced with permission. [72] Copyright 2018, Wiley-VCH. i) Au NRs with polystyrene-poly(acrylic acid) (PS-PAA) deposited at the side. Reproduced with permission. [78] Copyright 2018, Wiley-VCH. j) Au NRs with SiO 2 deposited at the ends and Pt deposited at the side. Reproduced with permission. [52] Copyright 2013, Wiley-VCH. k) Au NRs with SiO 2 deposited at the ends. Reproduced with permission. [81] Copyright 2010, American Chemical Society. l) Au NRs with TiO 2 deposited at the ends and Pt deposited at the side. Reproduced with permission. [82]

2D FeP Nanoframe Superlattices via Space‐Confined Topochemical Transformation

“…[27] On the other hand, the Kirkendall effect exploits the diffusion difference between dissimilar materials to generate voids, typically involving the reaction of colloidal metal NCs with elemental O, S, or Se. [29][30][31] Despite these advances in the synthesis of hollow NCs, however, constructing superlattice materials from hollow NCs remains a substantial challenge and has been rarely reported thus far.…”

Emerging Methods for Controlling Hot Carrier Excitation and Emission Distributions in Nanoplasmonic Systems

“…Along with increasingly precise and versatile nanofabrication capabilities, 21 synthetic techniques have emerged in the past decade that enable controlled anisotropic metal, semiconductor (e.g., TiO 2 ), dielectric (e.g., SiO 2 ), and other coatings on metal nanoparticles (Figure 2a), 19,21,51,57−63 as reviewed recently. 64 In many cases these synthetic techniques for anisotropic coatings take advantage of the reduced density of ligands such as cetyltrimethylammonium bromide (CTAB) in regions of high nanoparticle curvature 59 to either (i) selectively grow the desired coatings in these regions, 51,57 or (ii) bind larger ligands that prevent further growth, thereby promoting growth in other surface regions in subsequent coating steps. 19,57 Both dense and mesoporous silica coatings are commonly used to stabilize nanoparticles in solution while providing increased morphological photostability, 65,66 with mesoporous silica additionally providing channels for size-filtered molecular access to the metal surface.…”

“…Only recently, however, has the design of nonuniform nanoparticle coatings with tens-of-nanometer or better spatial precision become feasible. Along with increasingly precise and versatile nanofabrication capabilities, synthetic techniques have emerged in the past decade that enable controlled anisotropic metal, semiconductor (e.g., TiO 2 ), dielectric (e.g., SiO 2 ), and other coatings on metal nanoparticles (Figure a), ,,,− as reviewed recently . In many cases these synthetic techniques for anisotropic coatings take advantage of the reduced density of ligands such as cetyltrimethylammonium bromide (CTAB) in regions of high nanoparticle curvature to either (i) selectively grow the desired coatings in these regions, , or (ii) bind larger ligands that prevent further growth, thereby promoting growth in other surface regions in subsequent coating steps. , …”

Symmetry-breaking synthesis of Janus Au/CeO2 nanostructures for visible-light nitrogen photofixation

“…A feasible way to achieve effective charge separation is breaking the symmetry in the growth process to construct asymmetric metal/semiconductor nanostructures, such as dumbbell-shaped or Janus nanostructures. [34][35][36][37][38][39][40][41] We have previously reported dumbbellshaped Au/end-CeO 2 nanostructures through the site-selective growth of CeO 2 on the ends of Au nanorods. 37 In contrast to the selective growth on the ends of Au nanorods by virtue of the curvature difference, the selective growth of a semiconductor on the partial surface of Au NSs is also a grant challenge due to the spherically symmetric structures.…”