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Structural and electronic investigation of metal-semiconductor hybrid tetrapod hetero-structures

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Abstract

This article highlights the new electronic properties of tetrapod hetero-structures with metal Au core and semiconductor CdSe arms, which is one of the new classes of hybrid metal-semiconductor nanostructures. From the analysis of XRD, HRTEM, HAADF-STEM images, and EDAX line-scan studies, the growth mechanism of all these hetero-structures is proposed. These findings are important from the basic fundamental aspects of understanding the shape control of hetero-structures. Scanning tunneling spectroscopic study confirms the coulomb staircase-like features near Au which is characteristic of Au nanoparticles and the gap increases as we move the tip towards CdSe. Analysis suggests that the resonance tunneling occurs between valance band edge (conduction band edge) of CdSe and coulomb stairs of Au dot. These tetrapod hetero-structures could pave the way for designing new optical-based materials for developing new challenging photonic devices.

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Acknowledgements

The research work was funded by research seed money to Haldar KK from the Central University of Punjab, Bathinda, India.

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Authors and Affiliations

  1. Centre for Chemical Sciences, School of Basic and Applied Sciences, Central University of Punjab, Bathinda, Punjab, 151001, India

    Krishna Kanta Haldar

  2. Centre for Computational Sciences, School of Basic and Applied Sciences, Central University of Punjab, Bathinda, Punjab, 151001, India

    Vijaykumar Yogesh Muley

  3. Department of Applied Physics, Defense Institute of Advanced Technology, Pune, 411025, India

    Suwarna Datar

  4. Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata, 700032, India

    Amitava Patra

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  1. Krishna Kanta Haldar
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  2. Vijaykumar Yogesh Muley
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  3. Suwarna Datar
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  4. Amitava Patra
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Corresponding author

Correspondence to Krishna Kanta Haldar.

Electronic supplementary material

Details of experimental and characterization procedure of Au/CdSe nanotetrapod. Figure S1 shows the TEM images of AuSe nanoparticles. Figure S2 presents the TEM-EDX analysis of AuSe.

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Haldar, K.K., Muley, V.Y., Datar, S. et al. Structural and electronic investigation of metal-semiconductor hybrid tetrapod hetero-structures. Gold Bull 50, 105–110 (2017). https://doi.org/10.1007/s13404-017-0198-8

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  • DOI: https://doi.org/10.1007/s13404-017-0198-8

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