TY - JOUR
T1 - Synthesis of citrate-capped copper nanoparticles
T2 - A low temperature sintering approach for the fabrication of oxidation stable flexible conductive film
AU - Sarwar, Nasir
AU - Choi, Seung Hee
AU - Dastgeer, Ghulam
AU - Humayoun, Usama Bin
AU - Kumar, Mohit
AU - Nawaz, Ali
AU - Jeong, Dong In
AU - Zaidi, Syed Farrukh Alam
AU - Yoon, Dae Ho
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/3/15
Y1 - 2021/3/15
N2 - Printable flexible electronics are gaining attention day by day over the last few years due to the increasing demand for wearable electronics. Copper-based conductive inks are the most promising material for printing flexible electronics due to their high conductivity and cost-effectiveness. However, high-temperature sintering under reductive environment, rapid oxidation in the air and poor bending stability are the big constrains in the widespread utilization of copper inks. Herein we describe a facile method for fabrication of flexible conductive PET film under ambient air using as-synthesized citrate-capped copper nanoparticles. Sodium alginate paste (made in hydrazine) was used as a sintering aid to make the film conductive at low heating temperature. The citric acid capping protects the particles from oxidation while esterification with sodium alginate contribute to mechanical stability. The achieved resistivity of 74.4 ± 9 × 10−2 μΩ m is way better than reported in literature considering ambient air sintering under 60 ○C with improved adhesion, to the best of our knowledge. Persistent current flow even after 2500 bending cycles (not reported before) shows the exceptional mechanical stability of our film against bending, while the utilization of facial screen-printing fabrication technology made the process commercially viable and cost-effective.
AB - Printable flexible electronics are gaining attention day by day over the last few years due to the increasing demand for wearable electronics. Copper-based conductive inks are the most promising material for printing flexible electronics due to their high conductivity and cost-effectiveness. However, high-temperature sintering under reductive environment, rapid oxidation in the air and poor bending stability are the big constrains in the widespread utilization of copper inks. Herein we describe a facile method for fabrication of flexible conductive PET film under ambient air using as-synthesized citrate-capped copper nanoparticles. Sodium alginate paste (made in hydrazine) was used as a sintering aid to make the film conductive at low heating temperature. The citric acid capping protects the particles from oxidation while esterification with sodium alginate contribute to mechanical stability. The achieved resistivity of 74.4 ± 9 × 10−2 μΩ m is way better than reported in literature considering ambient air sintering under 60 ○C with improved adhesion, to the best of our knowledge. Persistent current flow even after 2500 bending cycles (not reported before) shows the exceptional mechanical stability of our film against bending, while the utilization of facial screen-printing fabrication technology made the process commercially viable and cost-effective.
KW - Copper conductive inks
KW - Flexible conductive film
KW - Low temperature sintering
KW - Oxidation and bending stability
KW - Screen printing
UR - https://www.scopus.com/pages/publications/85097641503
U2 - 10.1016/j.apsusc.2020.148609
DO - 10.1016/j.apsusc.2020.148609
M3 - Article
AN - SCOPUS:85097641503
SN - 0169-4332
VL - 542
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 148609
ER -