Uniform, Scalable, High-Temperature Microwave Shock for Nanoparticle Synthesis through Defect Engineering

Abstract

We demonstrate an ultrahigh-temperature thermal shock method for nanoparticle synthesis using microwave irradiation. With proper defect engineering, microwave absorption of 70% was achieved, leading to the instant temperature increase to 1,600 K in 100 ms, followed by rapid quenching to room temperature. During such extreme temperature change, the precursors are decomposed and reconstructed into nanoparticles with small size and uniform distribution. This facile, rapid, and universal synthesis technique has potential in large-scale production and suggests a new direction for nanosynthesis.

Remarkable surface-enhanced Raman scattering of highly crystalline monolayer Ti3C2 nanosheets

“…How to remove these organic groups without changing the shape and size is a difficult issue, because the common heating method would easily lead to the destruction of its ultrathin structure [45]. Recent studies have shown that, due to the generation of eddy currents, metallic graphene itself will be heated at a very fast rate (2000 K/0.1s) under microwave irradiation, thereby greatly improving its crystallinity and even decomposing the metal salts adsorbed on its surface [46,47]. Inspired by these work, since Ti 3 C 2 also has good electrical conductivity [48,49], can it also achieve an increase in crystallinity and elimination of organic groups through the extremely fast microwave heating?…”

Ultrafast and surfactant-free synthesis of Sub-3 nm nanoalloys by shear-assisted liquid-metal reduction

“…[1][2][3][4][5][6][7][8][9] The desire to fabricate metallic nanoalloys with controllable size and composition is oen for an enhancement in specic properties due to their high specic surface area, rich diversity of compositions and structures, and their synergistic effects. [10][11][12][13][14][15][16][17] Previous studies have shown that Pt-based alloys present good catalytic activity as an ideal catalyst for the hydrogen evolution reaction, oxygen reduction reaction, and ethanol oxidation reaction. [18][19][20][21][22][23][24] At the same time, the alloying of low-cost transition metals and precious metals can effectively reduce the amount of precious metals and control costs.…”

“…25 However, current methods of manufacturing alloys are generally complicated and time consuming, and therefore it is very important to develop a convenient, efficient, and rapid method of manufacturing alloys. 12,26,27 Commonly, the wet chemistry synthesis of well-dispersed alloy NPs needs the assistance of organic surfactants or capping agents, such as cetyltrimethylammonium chloride, ethylene glycol, oleic acid, or oleylamines, to protect them from agglomeration. [28][29][30][31][32][33] Nevertheless, the residual surfactants are oen difficult to remove completely, which makes it difficult to obtain nanocrystals with clean surfaces.…”

Improving the electrochemical performance of a natural molybdenite/N-doped graphene composite anode for lithium-ion batteries via short-time microwave irradiation

“…[27][28][29][30][31] For the last decade, solvent-free microwave irradiation synthesis methods have been gradually developed [32][33][34][35][36][37][38] and some novel uses of solvent-free microwave irradiation have been explored such as microwave carbonization 39 and the synthesis of nanoparticles. 36 Previous studies showed that graphene can effectively absorb microwaves and generate a lot of heat and the temperature can rapidly rise above 1000 C in a few seconds, and the particles loaded on the graphene can transform into nanoparticles from microparticles. 36 These facts inspire us to use this method to treat MoS 2 /graphene composites or similar congurations to remove the chemical modiers or cross-linkers and reduce graphene in a short time to improve the electrochemical performance of composite electrodes.…”

“…36 Previous studies showed that graphene can effectively absorb microwaves and generate a lot of heat and the temperature can rapidly rise above 1000 C in a few seconds, and the particles loaded on the graphene can transform into nanoparticles from microparticles. 36 These facts inspire us to use this method to treat MoS 2 /graphene composites or similar congurations to remove the chemical modiers or cross-linkers and reduce graphene in a short time to improve the electrochemical performance of composite electrodes.…”