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N,N-Diethyl-diaminopropane-copper(II) oxalate self-reducible complex for the solution-based synthesis of copper nanocrystals

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Abstract

Metal oxalates (C2O42−, ox) have been explored as promising precursors for the direct transformation of their oxalate moieties into metallic or metal oxide crystals via thermal decomposition without the formation of any byproducts due to releasing CO2 gas. The copper(II) oxalate (Cu(ox)) crystal is a coordination polymer composed of an infinite coordination network with a thermal decomposition temperature around 300 °C; however, their insoluble nature in any solvents and relatively high decomposition temperature do not allow the solution-based syntheses of surface-modified metallic Cu nanocrystals (NCs) in the presence of various surfactants such as long-chain alkylamines and alkylcarboxylates which have been used for increasing the dispersibility of NCs in organic solvents. In this study, the insoluble nature of Cu(ox) is overcome by mixing Cu(ox) crystals and N,N-diethyl-1,3-diaminopropane (dedap) to form a discrete complex, [Cu(ox)(dedap)2], whose structure is determined by X-ray crystallographic analysis. The obtained complex is well soluble in polar solvents and miscible with surfactants. Furthermore, it is decomposed at a moderate temperature of <170 °C with the evolution of CO2 gas; as a result, Cu NCs dispersible in organic solvents have been synthesized in suitable surfactants, such as the mixture of oleic acid, dodecylamine, and octylamine utilized as a reaction solvent. In addition, their potential application of the surface-modified Cu NCs as a conductive-ink has been preliminarily tested. The Cu film sintered at 280 °C exhibits a resistivity of 40 μΩ cm.

Graphical abstract: N,N-Diethyl-diaminopropane-copper(ii) oxalate self-reducible complex for the solution-based synthesis of copper nanocrystals

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Publication details

The article was received on 11 Jul 2017, accepted on 30 Aug 2017 and first published on 31 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT02510F
Citation: Dalton Trans., 2017, Advance Article
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    N,N-Diethyl-diaminopropane-copper(II) oxalate self-reducible complex for the solution-based synthesis of copper nanocrystals

    T. Togashi, M. Nakayama, R. Miyake, K. Uruma, K. Kanaizuka and M. Kurihara, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT02510F

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