Seed‐Mediated Growth of Silver Nanocubes in Aqueous Solution with Tunable Size and Their Conversion to Au Nanocages with Efficient Photothermal Property

Abstract

Two seed-mediated approaches for the growth of silver nanocubes in aqueous solution have been developed. Addition of a silver-seed solution to a mixture of cetyltrimethylammonium chloride (CTAC), silver trifluoroacetate, and ascorbic acid and heating the solution at 60 °C for 1.5 h produces uniform Ag nanocubes with tunable sizes from 23 to 60 nm by simply adjusting the volume of silver-seed solution introduced. Alternatively, the silver-seed solution can be injected into a mixture of cetyltrimethylammonium bromide (CTAB), silver nitrate, copper sulfate, and ascorbic acid and heated to 80 °C for 2 h to generate 46 nm silver nanocubes. Plate-like Ag nanocrystals exposing {111} surfaces can be synthesized by reducing Ag(NH3 )2 (+) with ascorbic acid in a CTAC solution. Relatively large Ag nanocubes were converted to cuboctahedral Au/Ag and Au nanocages and nanoframes with empty {111} faces through a galvanic replacement reaction. The nanocages showed a progressive plasmonic band red-shift with increasing Au content. The nanocages exhibited high and stable photothermal efficiency with solution temperatures quickly reaching beyond 100 °C when irradiated with an 808 nm laser for large heat and water vapor generation.

Aqueous‐Phase Synthesis of Size‐Tunable Copper Nanocubes for Efficient Aryl Alkyne Hydroboration

“…Preparation of Au and Ag nanocubes also yields right bipyramids as ab yproduct. [2,30] Attempts to make monodisperse Cu nanocubes smaller than 70 nm by reducing the amount of copper acetate used were unsuccessful;amixture of smaller cubes, right bipyramids and rods were produced. However,w ef ound Cu nanocubes with an average edge length of 60 nm can be obtained by heating the reaction mixture for just 20 min, althoughm ore right bipyramids are presenta sj udged from its UV-vis absorption spectrum( see Figure S3).…”

“…Compared to the more successful developments in the aqueous phase synthesis of polyhedral Au, Ag, and Pd nanocrystals, [1][2][3][4][5][6][7][8] coppern anocubes and octahedra have mainly been synthesized in hydrophobic organic media at very high temperatures. [9][10][11][12] Cu nanocubes have also been made in anhydrous ethylene glycol in the presence of poly(vinylpyrrolidone).…”

Recent Advances in Nanoparticle Shape and Composition Regulation Based on Galvanic Replacement for Cancer Treatment

“…Hollow nanocages exhibit fascinating characteristics, in that their localized surface plasmon resonances (LSPRs) shift to the near-infrared (NIR) wavelength region owing to the narrowing of the energy gap between the anti-symmetric anti-bonding resonance modes and the symmetric bonding resonance modes depending on shell thickness and diameter [109][110][111][112][113][114][115][116][117][118]. These high-extinction features in the NIR region induce strong exothermic phenomenon caused by the surface plasmon oscillation through laser irradiation in the corresponding wavelength range, which is often referred to as photothermal conversion [119][120][121][122][123][124][125][126][127][128][129][130][131][132][133]. In cancer treatment, photothermal conversion is highly efficient in killing cancer cells vulnerable to hyperthermia.…”

Nanocluster‐Mediated Synthesis of Diverse ZnTe Nanostructures: from Nanocrystals to 1D Nanobelts

“…[7] Additionally,itisalso amajor challenge to balancet he nucleation and growth processes in the formation of the semiconductor nanocrystals. [7,[10][11][12] Here, we take ZnTen anocrystal synthesis as an example to illustrate the nanocluster-mediateds ynthesis of diversen anostructures, startingw ith the ZnTen anoclusters due to the difficulty of direct nucleation-growth synthesis of ZnTenanostructures. [7,[10][11][12] Here, we take ZnTen anocrystal synthesis as an example to illustrate the nanocluster-mediateds ynthesis of diversen anostructures, startingw ith the ZnTen anoclusters due to the difficulty of direct nucleation-growth synthesis of ZnTenanostructures.…”