Single-layer graphene based resistive humidity sensor enhanced by graphene quantum dots.
Nanotechnology
; 35(18)2024 Feb 15.
Article
en En
| MEDLINE
| ID: mdl-38358678
ABSTRACT
Graphene is broadly applied as sensitive sensing material results from its superb features. Concurrently, as a derivative of graphene with 0D structure, graphene quantum dots (GQDs) offer more possibilities as a supportive sensing material due to its adjustable size and functional group modification. In this work, GQDs are introduced to single-layer graphene (SLG) based humidity sensor to enhance the sensing performance. Specifically, consistent resistance response to relative humidity (RH) is extended from the range of 10%-60% to 10%-90% by contrary to original SLG based sensor. Parallelly, effect of the amount of GQDs is investigated by means of multiple GQDs deposition. As the resultant higher binding efficiency between water molecules and the functional groups of GQDs, improved response rate is observed. For the case of 4-time deposition of GQDs, the response rate (ΔR/R) reaches â¼130% in RH range of 10%-90%. Besides, the response time and recovery time are â¼0.7 s and â¼1.1 s, respectively. The fluctuation of the resistance change of the sensor under constant humidity is less than 5% over a month which demonstrates long-term reliability.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Nanotechnology
Año:
2024
Tipo del documento:
Article