Low-Cost, Printed Memristor Using Indigo and a Dispersion of Colloidal Graphite Deposited by Spray Coating

The printed electronics presents the outstanding proposal to produce low-cost, solution-processable, vacuum-free and flexible devices. In this context, many researchers have been made efforts to obtain printed memories that works with low voltage bias, high on/off ratio and storage stability. Here, we report a novel low-cost printed version of a memristor based on spray coated films of indigo and colloidal graphite. This memory showed high performance for printed memristors, being the most remarkable aspect of this device its high on/off ratio of
$1.6\times 10^{6}$
at −1.15 V, and
$3.1\times 10^{4}$
for voltages as low as +0.1 V. The pulse-test mode read at +0.1 V revealed very stable endurance characteristics even after 100 readings and retention time over 10
⁴
s, as desired by the printed electronics niches.