Single-Crystal Metal Nanoplatelets:  Cobalt, Nickel, Copper, and Silver

Abstract

In this paper, single-crystal metallic nanoplatelets, such as cobalt, nickel, copper, and silver, have been successfully synthesized based on a facile hydrothermal/solvothermal synthetic method. The as-prepared cobalt nanoplatelets had the {001} crystal facets as the basal plane, while the exposed nanoplatelet planes were assigned to be {111} crystal facets of the face-centered cubic nickel, copper, and silver crystals. Owing to the interesting combination of novel nanostructures, remarkable magnetic anisotropy was found on the cobalt and nickel nanoplatelets. The anisotropic copper and silver nanoplatelets exhibited a distinct surface plasmon resonance effect. These metallic nanoplatelets could be expected to bring new opportunities in the vast research areas of and application in magnetic storage devices, catalysts, and surface-enhanced Raman scattering.

A NOVEL SYNTHESIS METHOD FOR SILVER NANOPARTICLES USING MOLTEN Ε-Caprolactam AS SOLVENT AND REDUCING AGENT

“…19 2.1 g of AgNO 3 was dissolved in 50 g of molten CL with magnetic stirring under continuous nitrogen atmosphere to prevent the possible oxidation of CL. A stoichiometric amount of NaOH pellets (0.5 g) was then rapidly added to the above AgNO 3 /CL solution at a certain temperature and the system was stirred for 2 h. After the precipitation reaction is over, the solution was cooled to about 80 C and then 100 mL of deionized water was added.…”

“…A stoichiometric amount of NaOH pellets (0.5 g) was then rapidly added to the above AgNO 3 /CL solution at a certain temperature and the system was stirred for 2 h. After the precipitation reaction is over, the solution was cooled to about 80 C and then 100 mL of deionized water was added. The mixture was separated by centrifugation, washed 3 times with distilled water to remove CL and the by-product NaNO 3 and then was dried in a vacuum oven at 80 C for 12 h.…”

“…1 In the past decades, various approaches, including thermal decomposition, hydrothermal/ solvothermal method, 2 microemulsion, 3 polyol process, 4 biosynthesis, 5 etc., have been utilized for the synthesis of Ag NPs. Among these methods, nonaqueous synthesis methods have received considerable attentions due to their simplicity and high quality.…”

“…Second, the theoretical conversion of AgNO 3 was 100%. Third, the raw materials were inexpensive and only three reagents (CL, AgNO 3 and NaOH) were used. Finally, the synthesized Ag NPs have excellent SERS performance for optical detection application.…”

Colloidal Noble‐Metal and Bimetallic Alloy Nanocrystals: A General Synthetic Method and Their Catalytic Hydrogenation Properties

“…[4][5][6][7][8][9][10][11][12][13] There have been numerous types of reactions that have been catalyzed by using colloidal noble-metal nanocrystals, particularly palladium and platinum, such as oxidations, cross-coupling reactions, electron-transfer reactions, hydrogenations, fuel-cell reactions, and many others. [14][15][16][17][18][19][20] Also, noble-metal alloy nanocrystals are of significant interest as electrocatalysts and selective oxidation and dehydrogenation catalysts. [21][22][23][24] On the other hand, noble-metal nanocrystals composed of multiple elements are of significant interest from both technological and scientific points of view for improving the activity and properties of catalysts.…”