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Open AccessFeature PaperArticle

Improved Photo-Ignition of Carbon Nanotubes/Ferrocene Using a Lipophilic Porphyrin under White Power LED Irradiation

1
Department of Innovation Engineering, University of Salento, Lecce 73100, Italy
2
Laboratório de Produtos e Tecnologia em Processos (LPT), Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Fortaleza 60440-900, Brazil
*
Author to whom correspondence should be addressed.
Materials 2018, 11(1), 127; https://doi.org/10.3390/ma11010127
Received: 21 December 2017 / Revised: 8 January 2018 / Accepted: 9 January 2018 / Published: 13 January 2018
(This article belongs to the Special Issue Hard and Soft Hybrid Functional Materials)
The aim of this work is to investigate and characterize the photo-ignition process of dry multi-walled carbon nanotubes (MWCNTs) mixed with ferrocene (FeCp2) powder, using an LED (light-emitting diode) as the light source, a combination that has never been used, to the best of our knowledge. The ignition process was improved by adding a lipophilic porphyrin (H2Pp) in powder to the MWCNTs/FeCp2 mixtures—thus, a lower ignition threshold was obtained. The ignition tests were carried out by employing a continuous emission and a pulsed white LED in two test campaigns. In the first, two MWCNT typologies, high purity (HP) and industrial grade (IG), were used without porphyrin, obtaining, for both, similar ignition thresholds. Furthermore, comparing ignition thresholds obtained with the LED source with those previously obtained with a Xenon (Xe) lamp, a significant reduction was observed. In the second test campaign, ignition tests were carried out by means of a properly driven and controlled pulsed XHP70 LED source. The minimum ignition energy (MIE) of IG-MWCNTs/FeCp2 samples was determined by varying the duration of the light pulse. Experimental results show that ignition is obtained with a pulse duration of 110 ms and a MIE density of 266 mJ/cm2. The significant reduction of the MIE value (10–40%), observed when H2Pp in powder form was added to the MWCNTs/FeCp2 mixtures, was ascribed to the improved photoexcitation and charge transfer properties of the lipophilic porphyrin molecules. View Full-Text
Keywords: multiwalled carbon nanotubes; ferrocene; metal nanoparticle ignitors; LED source; photo-induced ignition; porphyrin multiwalled carbon nanotubes; ferrocene; metal nanoparticle ignitors; LED source; photo-induced ignition; porphyrin
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MDPI and ACS Style

Visconti, P.; Primiceri, P.; De Fazio, R.; De Fazio, R.; Mazzetto, S.E.; Mele, G.; Carlucci, A.P. Improved Photo-Ignition of Carbon Nanotubes/Ferrocene Using a Lipophilic Porphyrin under White Power LED Irradiation. Materials 2018, 11, 127.

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