PMID- 28758671
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20180719
LR  - 20180719
IS  - 2040-3372 (Electronic)
IS  - 2040-3364 (Linking)
VI  - 9
IP  - 31
DP  - 2017 Aug 10
TI  - Switchable changes in the conductance of single-walled carbon nanotube networks 
      on exposure to water vapour.
PG  - 11279-11287
LID - 10.1039/c7nr02141k [doi]
AB  - We have discovered that wrapping single-walled carbon nanotubes (SWCNTs) with 
      ionic surfactants induces a switch in the conductance-humidity behaviour of SWCNT 
      networks. Residual cationic vs. anionic surfactant induces a respective increase 
      or decrease in the measured conductance across the SWCNT networks when exposed to 
      water vapour. The magnitude of this effect was found to be dependent on the 
      thickness of the deposited SWCNT films. Previously, chemical sensors, field 
      effect transistors (FETs) and transparent conductive films (TCFs) have been 
      fabricated from aqueous dispersions of surfactant functionalised SWCNTs. The 
      results reported here confirm that the electrical properties of such components, 
      based on randomly orientated SWCNT networks, can be significantly altered by the 
      presence of surfactant in the SWCNT layer. A mechanism for the observed behaviour 
      is proposed based on electrical measurements, Raman and UV-Vis-NIR spectroscopy. 
      Additionally, the potential for manipulating the sensitivity of the surfactant 
      functionalised SWCNTs to water vapour for atmospheric humidity sensing was 
      evaluated. The study also presents a simple method to establish the effectiveness 
      of surfactant removal techniques, and highlights the importance of characterising 
      the electrical properties of SWCNT-based devices in both dry and humid operating 
      environments for practical applications.
FAU - Evans, Gwyn P
AU  - Evans GP
AUID- ORCID: 0000-0002-3861-2438
AD  - Department of Security and Crime Science, University College London, 35 Tavistock 
      Sq., London, WC1H 9EZ, UK and Department of Chemistry, University College London, 
      20 Gordon St., London, WC1H 0AJ, UK. i.p.parkin@ucl.ac.uk.
FAU - Buckley, David J
AU  - Buckley DJ
AUID- ORCID: 0000-0002-5152-5443
AD  - Department of Chemistry, University College London, 20 Gordon St., London, WC1H 
      0AJ, UK. i.p.parkin@ucl.ac.uk.
FAU - Skipper, Neal T
AU  - Skipper NT
AUID- ORCID: 0000-0003-2940-3084
AD  - Department of Physics and Astronomy, University College London, Gower Street, 
      London, WC1E 6BT, UK and London Centre for Nanotechnology, 17-19 Gordon Street, 
      London WC1H 0AH, UK.
FAU - Parkin, Ivan P
AU  - Parkin IP
AUID- ORCID: 0000-0001-7661-1690
AD  - Department of Chemistry, University College London, 20 Gordon St., London, WC1H 
      0AJ, UK. i.p.parkin@ucl.ac.uk.
LA  - eng
PT  - Journal Article
PL  - England
TA  - Nanoscale
JT  - Nanoscale
JID - 101525249
EDAT- 2017/08/02 06:00
MHDA- 2017/08/02 06:01
CRDT- 2017/08/01 06:00
PHST- 2017/08/02 06:00 [pubmed]
PHST- 2017/08/02 06:01 [medline]
PHST- 2017/08/01 06:00 [entrez]
AID - 10.1039/c7nr02141k [doi]
PST - ppublish
SO  - Nanoscale. 2017 Aug 10;9(31):11279-11287. doi: 10.1039/c7nr02141k.