Giant Seebeck effect in pure fullerene thin films

Kojima, Hirotaka; Abe, Ryo; Ito, Mitsuhiro; Yasuyuki, Tomatsu; Fujiwara, Fumiya; Matsubara, Ryosuke; Yoshimoto, Noriyuki; Nakamura, Masakazu

doi:10.7567/apex.8.121301

Cited by 26 publications

(13 citation statements)

References 28 publications

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“…Recently, very large Seebeck coefficients of more than 150 mV K −1 have been reported for pure C 60 thin films by in situ measurements under ultrahigh vacuum (Figure 16g). 183 Because of their high resistance, it is difficult to accurately measure the Seebeck coefficient of pure (undoped) C 60 films. However, Nakamura et al developed a thermopower measurement system that solves this problem by using a custom highinput impedance differential amplifier.…”

Section: Organic Te Materialsmentioning

confidence: 99%

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Unconventional Thermoelectric Materials for Energy Harvesting and Sensing Applications

et al. 2021

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Heat is an abundant but often wasted source of energy. Thus, harvesting just a portion of this tremendous amount of energy holds significant promise for a more sustainable society. While traditional solid-state inorganic semiconductors have dominated the research stage on thermal-to-electrical energy conversion, carbon-based semiconductors have recently attracted a great deal of attention as potential thermoelectric materials for low-temperature energy harvesting, primarily driven by the high abundance of their atomic elements, ease of processing/manufacturing, and intrinsically low thermal conductivity. This quest for new materials has resulted in the discovery of several new kinds of thermoelectric materials and concepts capable of converting a heat flux into an electrical current by means of various types of particles transporting the electric charge: (i) electrons, (ii) ions, and (iii) redox molecules. This has contributed to expanding the applications envisaged for thermoelectric materials far beyond simple conversion of heat into electricity. This is the motivation behind this review. This work is divided in three sections. In the first section, we present the basic principle of the thermoelectric effects when the particles transporting the electric charge are electrons, ions, and redox molecules and describe the conceptual differences between the three thermodiffusion phenomena. In the second section, we review the efforts made on developing devices exploiting these three effects and give a thorough understanding of what limits their performance. In the third section, we review the state-of-the-art thermoelectric materials investigated so far and provide a comprehensive understanding of what limits charge and energy transport in each of these classes of materials.

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Section: Organic Te Materialsmentioning

confidence: 99%

Section: State-of-the-art Materialsmentioning

confidence: 99%

Unconventional Thermoelectric Materials for Energy Harvesting and Sensing Applications

et al. 2021

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“…In addition, since fullerols have better solubility in water than brominated fullerene, nanotechnology can tune and control the fundamental physicochemical properties of fullerenes derivatives by ordering them into molecular thin films [38][39][40][41][42][43][44][45][46][47] fabricating either hydrophilic or hydrophobic nanocoatings. The possibility to control the size and the orientation of fullerene moieties in 2D arrangements can lead to new functional low-dimensional materials with interesting and promising properties for controllable wetting applications [26] including corrosion resistant [48], smart textiles [49], self-cleaning [50] and directional wetting [51] surfaces as well as for developing lab-on-a-chip (LOC) devices [52] and biosensors [26].…”

Section: Introductionmentioning

confidence: 99%

Controlled deposition of fullerene derivatives within a graphene template by means of a modified Langmuir-Schaefer method

Kouloumpis

Vourdas²,

Zygouri

et al. 2018

Journal of Colloid and Interface Science

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The scientific and technological potential of graphene's includes the development of light, open 3D hybrid structures with high surface area, tunable pore size and aromatic functionalities. Towards this aim, we describe a scalable and low-cost bottom-up approach that combines self-assembly and Langmuir-Schaefer deposition for the production of fullerene-intercalated graphene oxide hybrids. This method uses graphene oxide (GO) nanosheets as template for the attachment of two types of fullerene derivatives (bromo-fullerenes, CBr and fullerols, C(OH)) in a bi-dimensional arrangement, allowing a layer-by-layer growth with control at nanoscale. Our film preparation approach relies on a bottom-up process that includes the formation of a hybrid organo-graphene Langmuir film, which is transferred onto a substrate and then brought in contact with C(OH) molecules in solution to induce self-assembly. In the case of grafting CBr molecules into graphene a further modification of the GO platelets was performed by bringing the surface of the transferred GO Langmuir film in contact with a second amino surfactant solution. Repeating these deposition cycles, pillared structures were fabricated in thin films form. These fullerene-based hybrid thin films were characterized by Raman and X-ray photoelectron (XPS) spectroscopies, X-ray diffraction (XRD), Atomic Force Microscopy (AFM) and contact angle measurements.

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“…While there are increasing number of reports on improvement of thermoelectric performance of sheet composed of CNTs or related carbon nanomaterials [20][21][22][23], the effect is often discussed based on a simplified picture that the thermoelectricity is mainly generated at the intertube junctions, and the body of CNT has minor contribution due to its high thermal conductivity (i.e. small temperature gradient).…”

Section: Introductionmentioning

confidence: 99%

Effects of defects on thermoelectric properties of carbon nanotubes

2017

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Carbon nanotubes (CNTs) have recently attracted attention as materials for flexible thermoelectric devices. To provide theoretical guideline of how defects influence the thermoelectric performance of CNTs, we theoretically studied the effects of defects (vacancies and Stone-Wales defects) on its thermoelectric properties; thermal conductance, electrical conductance, and Seebeck coefficient. The results revealed that the defects mostly strongly suppresses the electron conductance, and deteriorates the thermoelectric performance of a CNT. By plugging in the results and the intertube-junction properties into the network model, we further show that the defects with realistic concentrations can significantly degrade the thermoelectric performance of CNT-based networks. Our findings indicate the importance of the purification of CNTs for improving CNT-based thermoelectrics.

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Giant Seebeck effect in pure fullerene thin films

Cited by 26 publications

References 28 publications

Unconventional Thermoelectric Materials for Energy Harvesting and Sensing Applications

Unconventional Thermoelectric Materials for Energy Harvesting and Sensing Applications

Controlled deposition of fullerene derivatives within a graphene template by means of a modified Langmuir-Schaefer method

Effects of defects on thermoelectric properties of carbon nanotubes

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