Electrical behavior of laser-sintered Cu based metal-organic decomposition ink in air environment and application as current collectors in supercapacitor

Abstract

Cu based metal-organic decomposition (MOD) ink has been preferred as a printable conductive material in the field of printed electronics because it can mitigate the formation of undesired Cu oxide or precipitation of the metal source during storage and printing. However there will be oxidation of Cu during sintering process in air environment, for fabrication of conductive track from printed ink. In this paper, possibility of laser-sintering of Cu MOD ink in air was studied. The Cu MOD ink was spin-coated on polyimide (PI) substrate. The laser with 355 nm wavelength was accommodated as a heat source in this study. The parametric study with various laser power intensities and scan rates, showed 230-557 W/cm 2 and 1-8 mm/s as the feasible laser-sintering process window. As a result, the specific resistance of the laser-sintered Cu MOD ink was achieved 21 µΩcm which was about 10 times as much as that of bulk Cu. As an application, laser-sintered Cu MOD ink was confirmed to give acceptable performances compared to traditional Cu sheet electrodes as flexible current collectors of the supercapacitor.

Direct Laser Interference Ink Printing Using Copper Metal–Organic Decomposition Ink for Nanofabrication

“…This characteristic of MOD ink contributes to its long shelf life and economic efficiency and enables low-temperature and particle-free processing. Owing to these characteristics, MOD inks can be used to print on a polymer substrate [6,29] and are relatively free from several problems associated with NP ink. Despite the immense interest in MOD ink owing to these strengths, research on high-resolution nanofabrication processes using MOD ink remains insufficient.…”

“…In addition, it is suitable for the fabrication of nanopatterned surfaces. In direct laser writing (DLW) [26][27][28][29][30][31][32][33][34][35][36], lasers provide sufficient heat required for the chemical reaction of the ink. Although a few researchers have reported DLW using MOD ink [6,29], the resolution limit of typical metal DLW reaches only a few micrometers.…”

“…In direct laser writing (DLW) [26][27][28][29][30][31][32][33][34][35][36], lasers provide sufficient heat required for the chemical reaction of the ink. Although a few researchers have reported DLW using MOD ink [6,29], the resolution limit of typical metal DLW reaches only a few micrometers. For laser-based nanoprinting, photopolymerization-based 3D printing has been widely studied; however, this process requires photopolymers and is not suitable for metal printing.…”

Cu Patterning Using Femtosecond Laser Reductive Sintering of CuO Nanoparticles under Inert Gas Injection

“…Cu patterns are formed through laser light-induced thermochemical reduction. For example, Cu-organic decomposition and Cu-complex inks coated on substrates are selectively reduced by irradiating them with a CW or pulsed laser, which precipitates the Cu [8][9][10]. In Cu-organic decomposition ink, Cu patterns are formed from Cu(II) formate by a thermal reaction.…”

Inkjet Printing on a New Flexible Ceramic Substrate for Internet of Things (IoT) Applications

“…Typically, three types of ink are used in inkjet printing. They are metal nanoparticles (NPs) like silver (Ag), copper (Cu), or gold (Au), metal-organic decomposition (MOD) ink [ 19 ], and conductive polymers [ 20 ]. Among metal NP inks, silver has the lowest bulk resistivity, Ω-m [ 21 ].…”