Negative thermoelectric power of melt mixed vapor grown carbon nanofiber polypropylene composites

Paleo, A. J.; Vieira, E. M. F.; Wan, Kening; Bondarchuk, Oleksandr; Cerqueira, M. F.; Gonçalves, L. M.; Bilotti, Emiliano; Alpuim, P.; Rocha, A. M.

doi:10.1016/j.carbon.2019.05.035

Cited by 28 publications

(26 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Organic thermoelectric materials have been suggested as alternatives 8,9 alongside carbon materials 10 and composites of the two. 11,12 These materials have demonstrated decent power factors 9,11 and offer scalable processing by printing and other techniques, though ZT values are still well below unity.…”

Section: Introductionmentioning

confidence: 99%

Substitutional doping of hybrid organic–inorganic perovskite crystals for thermoelectrics

et al. 2020

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Substitutional doping of hybrid organic–inorganic perovskite crystals for thermoelectrics

et al. 2020

View full text Add to dashboard Cite

show abstract

“…By using PP based p-and n-type composites, they were able to prepare a demonstrator of a TE generator, which generated with 49 leg pairs a thermovoltage of 110 mV at 70 K temperature difference. Another way to generate n-type PP composites was described recently by Paleo et al [45], who incorporated 1 to 5 wt% carbon nanofibers into a PP matrix and reported Seebeck coefficients of about −8.5 µV/K.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen-Doped Carbon Nanotube/Polypropylene Composites with Negative Seebeck Coefficient

et al. 2020

View full text Add to dashboard Cite

This study describes the application of multi-walled carbon nanotubes that were nitrogen-doped during their synthesis (N-MWCNTs) in melt-mixed polypropylene (PP) composites. Different types of N-MWCNTs, synthesized using different methods, were used and compared. Four of the five MWCNT grades showed negative Seebeck coefficients (S), indicating n-type charge carrier behavior. All prepared composites (with a concentration between 2 and 7.5 wt% N-MWCNTs) also showed negative S values, which in most cases had a higher negative value than the corresponding nanotubes. The S values achieved were between 1.0 μV/K and −13.8 μV/K for the N-MWCNT buckypapers or powders and between −4.7 μV/K and −22.8 μV/K for the corresponding composites. With a higher content of N-MWCNTs, the increase in electrical conductivity led to increasing values of the power factor (PF) despite the unstable behavior of the Seebeck coefficient. The highest power factor was achieved with 4 wt% N-MWCNT, where a suitable combination of high electrical conductivity and acceptable Seebeck coefficient led to a PF value of 6.1 × 10−3 µW/(m·K2). First experiments have shown that transient absorption spectroscopy (TAS) is a useful tool to study the carrier transfer process in CNTs in composites and to correlate it with the Seebeck coefficient.

show abstract

“…Furthermore, for pristine SWCNT films, positive S-values are reported, e.g., by Nonoguchi et al [14] with 49 µV/K and Piao et al [15] with 39 µV/K (SWCNT from Thomas Swan Co. LTD, Consett, UK). Only recently a study by Paleo et al [16] reported a negative Seebeck coefficient for melt mixed composites based on PP in which the filler was an industrial high temperature treated carbon nanofiber (CNF) and no additives were added. Seebeck coefficients up to −8.5 µV/K (at 2.4 vol % loading) were reported.…”

Section: Introductionmentioning

confidence: 99%

Screening of Different Carbon Nanotubes in Melt-Mixed Polymer Composites with Different Polymer Matrices for Their Thermoelectrical Properties

et al. 2019

View full text Add to dashboard Cite

The aim of this study is to reveal the influences of carbon nanotube (CNT) and polymer type as well as CNT content on electrical conductivity, Seebeck coefficient (S), and the resulting power factor (PF) and figure of merit (ZT). Different commercially available and laboratory made CNTs were used to prepare melt-mixed composites on a small scale. CNTs typically lead to p-type composites with positive S-values. This was found for the two types of multi-walled CNTs (MWCNT) whereby higher Seebeck coefficient in the corresponding buckypapers resulted in higher values also in the composites. Nitrogen doped MWCNTs resulted in negative S-values in the buckypapers as well as in the polymer composites. When using single-walled CNTs (SWCNTs) with a positive S-value in the buckypapers, positive (polypropylene (PP), polycarbonate (PC), poly (vinylidene fluoride) (PVDF), and poly(butylene terephthalate) (PBT)) or negative (polyamide 66 (PA66), polyamide 6 (PA6), partially aromatic polyamide (PARA), acrylonitrile butadiene styrene (ABS)) S-values were obtained depending on the matrix polymer and SWCNT type. The study shows that the direct production of n-type melt-mixed polymer composites from p-type commercial SWCNTs with relatively high Seebeck coefficients is possible. The highest Seebeck coefficients obtained in this study were 66.4 µV/K (PBT/7 wt % SWCNT Tuball) and −57.1 µV/K (ABS/0.5 wt % SWCNT Tuball) for p- and n-type composites, respectively. The highest power factor and ZT of 0.28 µW/m·K2 and 3.1 × 10−4, respectively, were achieved in PBT with 4 wt % SWCNT Tuball.

show abstract

Negative thermoelectric power of melt mixed vapor grown carbon nanofiber polypropylene composites

Cited by 28 publications

References 42 publications

Substitutional doping of hybrid organic–inorganic perovskite crystals for thermoelectrics

Substitutional doping of hybrid organic–inorganic perovskite crystals for thermoelectrics

Nitrogen-Doped Carbon Nanotube/Polypropylene Composites with Negative Seebeck Coefficient

Screening of Different Carbon Nanotubes in Melt-Mixed Polymer Composites with Different Polymer Matrices for Their Thermoelectrical Properties

Contact Info

Product

Resources

About