Rapid optical determination of topological insulator nanoplate thickness and oxidation

Yang, Fan; Sendova, Mariana; Jacobs-Gedrim, Robin; Song, Eui Sang; Green, Avery; Thiesen, Peter; Diebold, Alain C.; Yu, Bin

doi:10.1063/1.4973403

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…One of the major concerns of chalcogenide-based TE films is their stability against environmental conditions since these can cause oxidation of the materials and, therefore, a decrease in their performance over time. − PMMA is a stable polymer up to 120 °C; it is hydrophobic and impermeable to air. − Embedding Sb 2 Te 3 and Bi 2 Te 3 nanoparticles in a polymeric matrix of PMMA can allow the final film to stay protected against environmental conditions. The stability of the optimized films with DDT has been studied as a function of time under ambient conditions at 25 °C and 67% humidity.…”

Section: Resultsmentioning

confidence: 99%

Thermoelectric Inks and Power Factor Tunability in Hybrid Films through All Solution Process

Serrano-Claumarchirant¹,

Hamawandi

Ergül

et al. 2022

ACS Appl. Mater. Interfaces

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Thermoelectric (TE) materials can have a strong benefit to harvest thermal energy if they can be applied to large areas without losing their performance over time. One way of achieving large-area films is through hybrid materials, where a blend of TE materials with polymers can be applied as coating.Here, we present the development of all solution-processed TE ink and hybrid films with varying contents of TE Sb 2 Te 3 and Bi 2 Te 3 nanomaterials, along with their characterization. Using (1-methoxy-2-propyl) acetate (MPA) as the solvent and poly (methyl methacrylate) as the durable polymer, large-area homogeneous hybrid TE films have been fabricated. The conductivity and TE power factor improve with nanoparticle volume fraction, peaking around 60−70% solid material fill factor. For larger fill factors, the conductivity drops, possibly because of an increase in the interface resistance through interface defects and reduced connectivity between the platelets in the medium. The use of dodecanethiol (DDT) as an additive in the ink formulation enabled an improvement in the electrical conductivity through modification of interfaces and the compactness of the resultant films, leading to a 4−5 times increase in the power factor for both p-and n-type hybrid TE films, respectively. The observed trends were captured by combining percolation theory with analytical resistive theory, with the above assumption of increasing interface resistance and connectivity with polymer volume reduction. The results obtained on these hybrid films open a new low-cost route to produce and implement TE coatings on a large scale, which can be ideal for driving flexible, large-area energy scavenging technologies such as personal medical devices and the IoT.

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Section: Resultsmentioning

confidence: 99%

Thermoelectric Inks and Power Factor Tunability in Hybrid Films through All Solution Process

Serrano-Claumarchirant¹,

Hamawandi

Ergül

et al. 2022

ACS Appl. Mater. Interfaces

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“…CVD is a promising and readily accessible method for the controllable growth of high-quality 2D vdW materials and heterostructures, [152,153] which is undoubtedly suitable for the growth of 2D vdW TMs (e.g., TI, [55,[154][155][156][157] WSM, [158][159][160][161][162] and DSM [125,[163][164][165][166] ) (Table 3). Typical schematic of CVD for growing various 2D vdW TMs is presented in Figure 4a-d.…”

Section: Chemical Vapor Depositionmentioning

confidence: 99%

Two‐Dimensional Van Der Waals Topological Materials: Preparation, Properties, and Device Applications

Zhang

et al. 2022

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Over the past decade, 2D van der Waals (vdW) topological materials (TMs), including topological insulators and topological semimetals, which combine atomically flat 2D layers and topologically nontrivial band structures, have attracted increasing attention in condensed‐matter physics and materials science. These easily cleavable and integrated TMs provide the ideal platform for exploring topological physics in the 2D limit, where new physical phenomena may emerge, and represent a potential to control and investigate exotic properties and device applications in nanoscale topological phases. However, multifaced efforts are still necessary, which is the prerequisite for the practical application of 2D vdW TMs. Herein, this review focuses on the preparation, properties, and device applications of 2D vdW TMs. First, three common preparation strategies for 2D vdW TMs are summarized, including single crystal exfoliation, chemical vapor deposition, and molecular beam epitaxy. Second, the origin and regulation of various properties of 2D vdW TMs are introduced, involving electronic properties, transport properties, optoelectronic properties, thermoelectricity, ferroelectricity, and magnetism. Third, some device applications of 2D vdW TMs are presented, including field‐effect transistors, memories, spintronic devices, and photodetectors. Finally, some significant challenges and opportunities for the practical application of 2D vdW TMs in 2D topological electronics are briefly addressed.

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Chemical vapor deposition synthesis of intrinsic van der Waals ferroelectric SbSI nanowires

Fu,

Zhao,

et al. 2024

Nano Res.

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Rapid optical determination of topological insulator nanoplate thickness and oxidation

Cited by 5 publications

References 18 publications

Thermoelectric Inks and Power Factor Tunability in Hybrid Films through All Solution Process

Thermoelectric Inks and Power Factor Tunability in Hybrid Films through All Solution Process

Two‐Dimensional Van Der Waals Topological Materials: Preparation, Properties, and Device Applications

Chemical vapor deposition synthesis of intrinsic van der Waals ferroelectric SbSI nanowires

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