2017
DOI: 10.1088/1361-6528/aa7995
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Highly efficient one-step synthesis of carbon encapsulated nanocrystals by the oxidation of metalπ-complexes

Abstract: Various carbon encapsulated nanocrystals, including MnS and MnO, CrO, MoO, FeS and FeO, and ZrO, are prepared in one step and in situ by a simple and highly efficient synthesis approach. The nanocrystals have an equiaxed morphology and a median size smaller than 30 nm. Tens and hundreds of these nanocrystals are entirely encapsulated by a wormlike amorphous carbon shell. The formation of a core-shell structure depends on the strongly exothermic reaction of metal π-complexes with ammonium persulfate in an autoc… Show more

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Cited by 5 publications
(3 citation statements)
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“…When the reaction took place in an autoclave, the large amount of heat and gases were confined in the space and cannot be released to the external environment, probably forming a propagating shock wave. The inner sudden high pressure and temperature would completely destroy the liquid intermediate phase into reactive radical species, which self-assembly transformed into the core-shell structure [11]. In addition, when the strong nitrate radical oxidized the hydrogen in the Cp ligand, the carbon shell was well preserved because the inadequate oxygen content in the autoclave and short high-temperature dwelling time could significantly alleviate its further oxidation.…”
Section: Resultsmentioning
confidence: 99%
“…When the reaction took place in an autoclave, the large amount of heat and gases were confined in the space and cannot be released to the external environment, probably forming a propagating shock wave. The inner sudden high pressure and temperature would completely destroy the liquid intermediate phase into reactive radical species, which self-assembly transformed into the core-shell structure [11]. In addition, when the strong nitrate radical oxidized the hydrogen in the Cp ligand, the carbon shell was well preserved because the inadequate oxygen content in the autoclave and short high-temperature dwelling time could significantly alleviate its further oxidation.…”
Section: Resultsmentioning
confidence: 99%
“…One of the dominant methods for single-step production of metal-carbon nanoparticles at a large scale is the direct current (DC) arc discharge [12][13][14][15][16][17], although other techniques have been used [18][19][20][21][22][23]. In the DC arc, the discharge is maintained between two electrodes, where an anode is usually made of graphite, which ablates and provides a feedstock of carbon for nanomaterials synthesis.…”
Section: Introductionmentioning
confidence: 99%
“…Recently, we have synthesized a dozen of carbon encapsulated metal oxide/sulfide nanocrystals with core-shell structure by the explosive reaction of metal -complex with oxidizing agent in an autoclave. [10][11][12] The synthesis finishes in 30 min and the temperature is as low as 200 ○ C. There is no need to consider the atmosphere in the reactor and only a pressure vessel is enough for the whole process rather than other complicated equipment. The large-scale production in quantity of tens of grams is also promising.…”
mentioning
confidence: 99%