Journal Article 12038-63-0 2D van der Waals layered materials 7440-15-5 Review Rhenium Sulfides artificial optoelectronic synapses brain-inspired computing convolutional neural networks flexible artificial synapses multi-valued logic multi-valued logic computing multiple-valued logic negative differential resistance negative differential transconductance negative-differential-resistance organic materials persistent photoconductivity effect reconfigurable devices and circuits rhenium disulfide rhenium sulfide ternary devices and circuits ternary logic van der Waals layered materials van der Waals materials