2014
DOI: 10.3390/s140406806 View full text |Buy / Rent full text
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Abstract: Multiwall carbon nanotubes (MWCNTs) were easily and efficiently decorated with Pd nanoparticles through a vapor-phase impregnation-decomposition method starting from palladium acetylacetonates. The sensor device consisted on a film of sensitive material (MWCNTs-Pd) deposited by drop coating on platinum interdigitated electrodes on a SiO2 substrate. The sensor exhibited a resistance change to ozone (O3) with a response time of 60 s at different temperatures and the capability of detecting concentrations up to 2… Show more

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“…In the second case, an efficient light source (such as a LED) is integrated in the sensor device reaching power needs comparable to those of conventionally heated sensors [5][6][7][8]. In the third case, sensor active layer functionalization [9,10], material decoration [11,12] and the use of hybrid materials [11,13,14] are traditional strategies to enhance and modify the active film properties, and hence the gas-surface interaction mechanism. In one way or another, state of the art gas sensors still require more than 10-100 mW (research devices) to maintain the elevated temperatures for good sensing performance, which limits their use in mobile distributed systems [15].…”
Section: Introductionmentioning
“…Star et al (2006) and also Lu et al (2004) decorated single-walled CNTs with Pt, Pd, Au or Rh for detecting a large variety of gases such as CO, NO 2 , CH 4 , H 2 S, NH 3 and H 2 , by discriminating from interfering gases. Moreover, recent works (Colindres et al, 2014;Doroodmand et al, 2013) concern the functionalization of CNTs with Pd and the electrodeposition of FeOOH nanostructures on CNTs for O 3 gas sensing, with a detection limit in the range of ppb and a high selectivity.…”
Section: Introductionmentioning
“…To overcome this problem and also for designing a sensor with high selectivity, functionalization of their surface is necessary. It is shown that functionalization with metal 1 3 nanoparticles, play a crucial role in producing gas sensors with high sensitivity [19][20][21][22][23][24][25][26][27][28]. Different experimental and theoretical studies have been performed for functionalization of carbon nanotubes and graphene, with metal nanoparticles, as the gas sensor [29][30][31][32][33][34][35].…”
Section: Introductionmentioning
“…Sensor requirements either in performance, physical, or cost, are application dependent [100]. Research activities on sensors in general and ozone sensors in particular, are aimed towards meeting recent sensing requirements, strengthening and upgrading some or all of the aforementioned parameters [11,12,49].…”
Section: Research Challengesmentioning
“…This review provides insight into vital fundamentals to gas sensing with optical fibre sensors. It is comprised of optical sensor mechanism [5], advantages of optical sensors [6,7], optical sensor classification [8], optical gas cells classification [9], Beer-Lambert law [10] and ozone gas and its research challenges [11][12][13]. Ozone is a trace gas in the atmosphere [14] and is discovered in 1839 [15].…”
Section: Introductionmentioning