Novel flexible chemical gas sensor based on poly(3,4-ethylenedioxythiophene) nanotube membrane.
Poly(3,4-ethylenedioxythiophene) nanotubes (PEDOT NTs) flexible membrane was successfully fabricated by vapor deposition polymerization (VDP) mediated electrospinning for ammonia gas detection. PVA nanofibers (NFs) were electrospun as a core part and polyvinyl alcohol (PVA)/PEDOT coaxial nanocables (NCs) were prepared by VDP method via EDOT monomer adsorption onto the electrospun PVA NFs as templates. To obtain the PEDOT NTs membrane, the PVA NFs were removed from PVA/PEDOT coaxial NCs with distilled water. PVA/PEDOT coaxial NCs and PEDOT NTs had the conductivities of 71 and 61 Scm(-1) and were applied as a transducer for ammonia gas detection in the range of 1-100 parts per million (ppm) of NH(3) gas. They exhibited the minimum detectable level of ca. 5 parts per million (ppm) and fast response time (less than 1s) towards ammonia gas. In a recovery time, the PEDOT NTs membrane sensor was ca. 30s and shorter compared to that of the membrane sensor based on the PVA/PEDOT NCs (ca. 50s). In addition, sensor performance of PEDOT NTs membrane was also undertaken as a function of membrane thickness. Thick membrane sensor (30 microm) had the enhanced sensitivity and the sensitivity on the membrane thickness was in the order of 30 microm>20 microm>10 microm at 60 ppm of NH(3) gas.
Kwon
Oh Seok
OS
School of Chemical and Biological Engineering, Seoul National University, 599 Gwanangro, Sillim-dong, Gwanak-gu, Seoul 151-742, Republic of Korea.
Park
Eunyu
E
Kweon
O Young
OY
Park
Seon Joo
SJ
Jang
Jyongsik
J
D000327:Adsorption; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry*; D005740:Gases / Q000032:analysis*; D008567:Membranes, Artificial; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D043942:Nanotubes; D011108:Polymers / Q000737:chemistry*
D019086:Bridged Bicyclo Compounds, Heterocyclic; D005740:Gases; D008567:Membranes, Artificial; D011108:Polymers; C121383:poly(3,4-ethylene dioxythiophene)