Two-Dimensional Mechano-thermoelectric Heterojunctions for Self-Powered Strain Sensors.
Nano Lett
; 21(16): 6990-6997, 2021 08 25.
Article
de En
| MEDLINE
| ID: mdl-34387505
We here demonstrate the multifunctional properties of atomically thin heterojunctions that are enabled by their strong interfacial interactions and their application toward self-powered sensors with unprecedented performance. Bonding between tin diselenide and graphene produces thermoelectric and mechanoelectric properties beyond the ability of either component. A record-breaking ZT of 2.43 originated from the synergistic combination of graphene's high carrier conductivity and SnSe2-mediated thermal conductivity lowering. Moreover, spatially varying interaction at the SnSe2/graphene interface produces stress localization that results in a novel 2D-crack-assisted strain sensing mechanism whose sensitivity (GF = 450) is superior to all other 2D materials. Finally, a graphene-assisted growth process permits the formation of high-quality heterojunctions directly on polymeric substrates for flexible and transparent sensors that achieve self-powered strain sensing from a small temperature gradient. Our work enhances the fundamental understanding of multifunctionality at the atomic scale and provides a route toward structural health monitoring through ubiquitous and smart devices.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Dispositifs électroniques portables
/
Graphite
Langue:
En
Journal:
Nano Lett
Année:
2021
Type de document:
Article
Pays d'affiliation:
Taïwan
Pays de publication:
États-Unis d'Amérique