Exceptional high Seebeck Coefficient and Gas-Flow-Induced Voltage in Multilayer Graphene

TL;DR

This study reveals that multilayer graphene exhibits a peak Seebeck coefficient at six layers and shows unusual gas-flow-induced voltage behavior, differing from expectations and other materials like aluminum nanofilms.

Contribution

It uncovers the layer-dependent Seebeck coefficient and flow-induced voltage behaviors in multilayer graphene, challenging existing assumptions about their proportionality.

Findings

Seebeck coefficient peaks at six layers (~77% higher than monolayer)

Flow-induced voltage varies non-monotonically with layer number

Thickness effects differ markedly from aluminum nanofilms

Abstract

Monolayer graphene shows Seebeck coefficient several times and gas-flow-induced voltage twenty times higher than that of bulk graphite. Here we find that the Seebeck coefficient of multilayer graphene increases monotonically with increasing layer and reaches its peak value at hexa-layer ~77% higher than for monolayer and then decreases, although the electric resistance decreases monotonically with increasing layer. The flow-induced voltage is significantly higher in 2, 4, 5, 6, 7 layered graphene than in 1, 3, 8 layered one, against the prevailing view that it should be proportional to Seebeck coefficient. These thickness effects are also in sharp contrast to that in continuous aluminum nanofilms.