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Synthesis and characterisation of a nano-silver soldering paste obtained by NaBH4 reduction in presence of PVP

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Dupont C. , Sobota J. , Głuchowski W. , Wrona A.

tom Vol. 64, nr 2

237--242

Purpose: In this work, a new synthesis has been investigated to obtain a nano-silver soldering paste capable of sintering at low temperature. Design/methodology/approach: The nano-silver soldering paste has been obtained by chemical reduction, with sodium borohydride (NaBH4) in presence of polyvinylpyrrolidone (PVP). The paste has been used for bonding two Cu plates. The Cu-Ag-Cu joint was obtained by sintering the nano-silver paste at a temperature ranging from 200°C to 400°C, in air, under a normal load of 5 MPa. The shear strength of the joints has been measured. Findings: The Ag particles obtained by this method are spherical, with an average size of 100 nm which allow sintering at low temperature. A sintering temperature of 250°C is sufficient for bonding two copper plates and the paste with an Ag/PVP weight ratio of 2.45 offers the best results. However, a maximum shear strength of 51 N is measured which is lower than the literature reference for large Cu chips bonding. Research limitations/implications: Other Ag/PVP ratio should be investigated in order to minimise the presence of impurities introduced by the reactant. Investigations concerning the Cu surface treatment, for improving the shear strength of the bond, should also be realised. Practical implications: The nano-silver soldering paste cannot be applied, yet, in electronic industry. Further improvements are required. Originality/value: The synthesis of nano-silver soldering paste by chemical reduction with NaBH4 in presence of PVP can be realised in one-step, at room temperature, which is important to minimise the synthesis costs.