TY - JOUR
T1 - A low-cost miniaturized colorimetric sensor with vertically-stacked semi-transparent finger-type organic photo detector for formaldehyde sensing
AU - Lin, Ching Fu
AU - Zan, Hsiao Wen
AU - Lu, Chia Jung
AU - Meng, Hsin Fei
AU - Soppera, Olivier
N1 - Funding Information:
This work was supported by the Ministry of Science and Technology (MOST) , Taiwan (Project number 107-2221-E-009 -086 , and 108-2923-E-009 -002 -MY3 ), and the Higher Education Sprout Project of the National Chiao Tung University and Ministry of Education (MOE), Taiwan .
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/10
Y1 - 2019/10
N2 - We proposed a sensitive colorimetric sensing system using a paper-like sensing layer on top of a vertically stacked finger-type organic photodetector (OPD) and commercial light-emitting diode (LED). The stacked OPD/LED device was small, with an area of 0.8 cm × 0.5 cm that was even smaller than a coin. Using commercial colorimetric formaldehyde (HCHO) sensing molecules to form the sensing layer, the stacked detecting system successfully detected HCHO of concentrations ranging from 40 to 1000 ppb within 20 min. Critical parameters affecting the sensitivity were investigated. The final system exhibited a stable calibration curve over 60 days. The long lifetime was attributed to using 2,6-Bis(trimethyltin)-4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene (PBDTTT-C-T): phenyl-C71-butyric acid methyl ester (PC71BM) to serve as a blended system and using the current variation ratio to represent the sensing response.
AB - We proposed a sensitive colorimetric sensing system using a paper-like sensing layer on top of a vertically stacked finger-type organic photodetector (OPD) and commercial light-emitting diode (LED). The stacked OPD/LED device was small, with an area of 0.8 cm × 0.5 cm that was even smaller than a coin. Using commercial colorimetric formaldehyde (HCHO) sensing molecules to form the sensing layer, the stacked detecting system successfully detected HCHO of concentrations ranging from 40 to 1000 ppb within 20 min. Critical parameters affecting the sensitivity were investigated. The final system exhibited a stable calibration curve over 60 days. The long lifetime was attributed to using 2,6-Bis(trimethyltin)-4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene (PBDTTT-C-T): phenyl-C71-butyric acid methyl ester (PC71BM) to serve as a blended system and using the current variation ratio to represent the sensing response.
KW - Colorimetric-type sensing
KW - Finger type
KW - Formaldehyde sensing
KW - Organic photodetector
KW - Vertically integrated
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U2 - 10.1016/j.orgel.2019.05.037
DO - 10.1016/j.orgel.2019.05.037
M3 - Article
AN - SCOPUS:85066961022
SN - 1566-1199
VL - 73
SP - 115
EP - 121
JO - Organic Electronics: physics, materials, applications
JF - Organic Electronics: physics, materials, applications
ER -