TY - JOUR

T1 - Graphene-PEDOT

T2 - PSS humidity sensors for high sensitive, low-cost, highly-reliable, flexible, and printed electronics

AU - Popov, Vasiliy I.

AU - Kotin, Igor A.

AU - Nebogatikova, Nadezhda A.

AU - Smagulova, Svetlana A.

AU - Antonova, Irina V.

N1 - Publisher Copyright: © 2019 by the authors.

PY - 2019/10/24

Y1 - 2019/10/24

N2 - A comparison of the structure and sensitivity of humidity sensors prepared from graphene (G)-PEDOT: PSS (poly (3,4-ethylenedioxythiophene)) composite material on flexible and solid substrates is performed. Upon an increase in humidity, the G: PEDOT: PSS composite films ensure a response (a linear increase in resistance versus humidity) up to 220% without restrictions typical of sensors fabricated from PEDOT: PSS. It was found that the response of the examined sensors depends not only on the composition of the layer and on its thickness but, also, on the substrate used. The capability of flexible substrates to absorb the liquid component of the ink used to print the sensors markedly alters the structure of the film, making it more porous; as a result, the response to moisture increases. However, in the case of using paper, a hysteresis of resistance occurs during an increase or decrease of humidity; that hysteresis is associated with the capability of such substrates to absorb moisture and transfer it to the sensing layer of the sensor. A study of the properties of G: PEDOT: PSS films and test device structures under deformation showed that when the G: PEDOT: PSS films or structures are bent to a bending radius of 3 mm (1.5% strain), the properties of those films and structures remain unchanged. This result makes the composite humidity sensors based on G: PEDOT: PSS films promising devices for use in flexible and printed electronics.

AB - A comparison of the structure and sensitivity of humidity sensors prepared from graphene (G)-PEDOT: PSS (poly (3,4-ethylenedioxythiophene)) composite material on flexible and solid substrates is performed. Upon an increase in humidity, the G: PEDOT: PSS composite films ensure a response (a linear increase in resistance versus humidity) up to 220% without restrictions typical of sensors fabricated from PEDOT: PSS. It was found that the response of the examined sensors depends not only on the composition of the layer and on its thickness but, also, on the substrate used. The capability of flexible substrates to absorb the liquid component of the ink used to print the sensors markedly alters the structure of the film, making it more porous; as a result, the response to moisture increases. However, in the case of using paper, a hysteresis of resistance occurs during an increase or decrease of humidity; that hysteresis is associated with the capability of such substrates to absorb moisture and transfer it to the sensing layer of the sensor. A study of the properties of G: PEDOT: PSS films and test device structures under deformation showed that when the G: PEDOT: PSS films or structures are bent to a bending radius of 3 mm (1.5% strain), the properties of those films and structures remain unchanged. This result makes the composite humidity sensors based on G: PEDOT: PSS films promising devices for use in flexible and printed electronics.

KW - Flexible test devices

KW - Graphene: PEDOT: PSS composite

KW - Humidity sensors

KW - Printed structures

KW - Response

KW - printed structures

KW - response

KW - humidity sensors

KW - flexible test devices

KW - graphene: PEDOT: PSS composite

KW - COMPOSITE

UR - http://www.scopus.com/inward/record.url?scp=85074633651&partnerID=8YFLogxK

U2 - 10.3390/ma12213477

DO - 10.3390/ma12213477

M3 - Article

C2 - 31652892

AN - SCOPUS:85074633651

VL - 12

JO - Materials

JF - Materials

SN - 1996-1944

IS - 21

M1 - 3477

ER -