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Yang L, Tao Y, Gordon MP, Menon AK, Chen Y, Prasher RS, Urban JJ. Morphological Ordering of the Organic Layer for High-Performance Hybrid Thermoelectrics. ACS Appl Mater Interfaces 2022; 14:57460-57470. [PMID: 36524813 DOI: 10.1021/acsami.2c19156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Inorganic-organic hybrids, such as Te-PEDOT:PSS core/shell nanowires, have emerged as a class of promising thermoelectric materials with combined attributes of mechanical flexibility and low cost. However, the poorly understood structure-property relationship calls for further investigation for performance enhancement. Here, through precise treatments of focused electron beam irradiation and thermal annealing on individual Te-PEDOT:PSS nanowires, new, nonchemical mechanisms are introduced to specifically engineer the organic phase, and the measured results provide an unprecedented piece of evidence, confirming the dominant role of organic shell in charge transport. Paired with the Kang-Snyder model and molecular dynamics simulations, this work provides mechanistic insights in terms of heating-enabled morphological ordering of the polymer chains. The measured results show that thermal annealing on the 42 nm nanowire results in a ZT value of 0.78 at 450 K. Through leveraging the interfacial self-assembly of the organic phase to construct a high electrical conductivity domain, this work lays out a clear framework for the development of next-generation soft thermoelectrics.
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Affiliation(s)
- Lin Yang
- Department of Advanced Manufacturing and Robotics, College of Engineering, Peking University, Beijing100871, P. R. China
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
| | - Yi Tao
- School of Mechanical Engineering and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing210096, P. R. China
| | - Madeleine P Gordon
- Applied Science and Technology Graduate Group, University of California, Berkeley, California94720, United States
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
| | - Akanksha K Menon
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia30332, United States
| | - Yunfei Chen
- School of Mechanical Engineering and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing210096, P. R. China
| | - Ravi S Prasher
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
- Department of Mechanical Engineering, University of California, Berkeley, California94720, United States
| | - Jeffrey J Urban
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
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Giedraityte Z, Tuomisto M, Lastusaari M, Karppinen M. Three- and Two-Photon NIR-to-Vis (Yb,Er) Upconversion from ALD/MLD-Fabricated Molecular Hybrid Thin Films. ACS Appl Mater Interfaces 2018; 10:8845-8852. [PMID: 29446918 PMCID: PMC6168183 DOI: 10.1021/acsami.7b19303] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 02/15/2018] [Indexed: 05/31/2023]
Abstract
We report blue, green, and red upconversion emissions with strongly angular-dependent intensities for a new type of hybrid (Y,Yb,Er)-pyrazine thin films realized using the atomic/molecular layer deposition thin-film fabrication technology. The luminescence emissions in our amorphous (Y,Yb,Er)-pyrazine thin films of a controllable nanothickness originate from three- and two-photon NIR-to-vis excitation processes. In addition to shielding the lanthanide ions from nonradiative de-excitation, the network of interconnected organic molecules serves as an excellent matrix for the Yb3+-to-Er3+ excitation energy transfer. This suggests a new approach to achieve efficient upconverting molecular materials with the potential to be used for next-generation medical diagnostics, waveguides, and surface-sensitive detectors.
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Affiliation(s)
- Zivile Giedraityte
- Department
of Chemistry and Materials Science, Aalto
University, FI-00076 Aalto, Finland
| | - Minnea Tuomisto
- Department
of Chemistry, University of Turku, FI-20014 Turku, Finland
- Doctoral
Programme in Physical and Chemical Sciences, University of Turku Graduate School (UTUGS), FI-20014 Turku, Finland
| | - Mika Lastusaari
- Department
of Chemistry, University of Turku, FI-20014 Turku, Finland
- Turku
University Centre for Materials and Surfaces (MatSurf), FI-20014 Turku, Finland
| | - Maarit Karppinen
- Department
of Chemistry and Materials Science, Aalto
University, FI-00076 Aalto, Finland
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Chen YC, Liu TC, Hsu YJ. ZnSe·0.5N2H4 hybrid nanostructures: a promising alternative photocatalyst for solar conversion. ACS Appl Mater Interfaces 2015; 7:1616-23. [PMID: 25541641 DOI: 10.1021/am507085u] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
As the molecular precursor of ZnSe, ZnSe·0.5N2H4 inorganic-organic hybrids have received relatively less attention due to the feasibility of their further processing and decomposition into pure-phase ZnSe. Here we demonstrated that ZnSe·0.5N2H4 hybrid nanostructures, which were prepared using a facile hydrazine-assisted hydrothermal method, may practically harvest solar energy for photoconversion applications. By modulating the volume ratio of hydrazine hydrate to deionized water employed in the synthesis, the morphology of the grown ZnSe·0.5N2H4 can be varied, which included nanowires, nanobelts and nanoflakes. With the relatively long exciton lifetime and highly anisotropic structure, ZnSe·0.5N2H4 nanowires performed much better in the photodegradation of rhodamine B than the other two counterpart products. As compared to pure ZnSe nanoparticles and single-phase ZnSe nanowires obtained from further processing ZnSe·0.5N2H4, the ZnSe·0.5N2H4 hybrid nanowires exhibited superior photocatalytic performance under visible light illumination. The hybrid nanowires were further decorated with Au particles to endow them with structural and compositional diversities. Time-resolved photoluminescence spectra suggested that almost 40% of the photoexcited electrons in ZnSe·0.5N2H4 nanowires can be transported to the decorated Au, which enabled a fuller extent of participation of charge carriers in the photocatalytic process and thus conduced to a significant enhancement in the photocatalytic activity. The demonstrations from this work illustrate that ZnSe·0.5N2H4 hybrid nanostructures can serve as a versatile photocatalyst platform for advanced photocatalytic applications.
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Affiliation(s)
- Yu-Chih Chen
- Department of Materials Science and Engineering, National Chiao Tung University , 1001 University Road, Hsinchu, Taiwan 30010, Republic of China
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