Water-stable organic transistors and their application in chemical and biological sensors.
The development of low-cost, reliable sensors will rely on devices capable of converting an analyte binding event to an easily read electrical signal. Organic thin-film transistors (OTFTs) are ideal for inexpensive, single-use chemical or biological sensors because of their compatibility with flexible, large-area substrates, simple processing, and highly tunable active layer materials. We have fabricated low-operating voltage OTFTs with a cross-linked polymer gate dielectric, which display stable operation under aqueous conditions over >10(4) electrical cycles using the p-channel semiconductor 5,5'-bis-(7-dodecyl-9H-fluoren-2-yl)-2,2'-bithiophene (DDFTTF). OTFT sensors were demonstrated in aqueous solutions with concentrations as low as parts per billion for trinitrobenzene, methylphosphonic acid, cysteine, and glucose. This work demonstrates of reliable OTFT operation in aqueous media, hence opening new possibilities of chemical and biological sensing with OTFTs.
Roberts
Mark E
ME
Department of Chemical Engineering, Stanford University, Stauffer III, 381 North-South Mall, Stanford, CA 94305, USA.
Mannsfeld
Stefan C B
SC
Queraltó
Núria
N
Reese
Colin
C
Locklin
Jason
J
Knoll
Wolfgang
W
Bao
Zhenan
Z
D015374:Biosensing Techniques / Q000379:methods*; D003545:Cysteine / Q000032:analysis; D005947:Glucose / Q000032:analysis; D009930:Organic Chemicals / Q000032:analysis; D009943:Organophosphorus Compounds / Q000032:analysis; D014173:Transistors, Electronic / Q000592:standards*; D014301:Trinitrobenzenes / Q000032:analysis; D014867:Water
D009930:Organic Chemicals; D009943:Organophosphorus Compounds; D014301:Trinitrobenzenes; D014867:Water; C032627:methylphosphonic acid; D005947:Glucose; D003545:Cysteine