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Journal of Materials Science

, Volume 53, Issue 11, pp 8120–8131 | Cite as

Novel SiQDs–MoS2 heterostructures with increasing solar absorption for the photocatalytic degradation of malachite green

Chemical routes to materials
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Abstract

Novel heterostructures based on silicon quantum dots and molybdenum disulfide nanosheets (SiQDs–MoS2) were synthesized by a hydrothermal method, in which the introduced SiQDs play a determining role in manipulating the morphology, phase and band structure of MoS2. The resultant SiQDs–MoS2 is uniform flowerlike 3D microspheres assembled from petallike 2D MoS2 nanosheets anchored with 0D SiQDs, possessing abundant active sites. Besides, the primary MoS2 nanosheets consist of both semiconductive 2H and metallic 1T phases accompanied with intralayer mesopores and expanded interlayer spacing, endowing the resulting architectures with effective electron transfer. Significantly, the as-synthesized SiQDs–MoS2 exhibits intense full solar-spectrum absorption, indicating efficient solar energy harvesting. First-principles calculations simulate similar increased spectral absorption of monolayer MoS2 adhered with a Si cluster, suggesting the existence of new energy states associated with the integration of SiQDs and MoS2 nanosheets as evidenced by photoluminescence (PL) spectral analysis. As expected, the current SiQDs–MoS2 heterostructures demonstrate substantial photocatalytic activity even under visible and near-infrared (NIR) light on degradation of malachite green (MG). The type II electronic structure of SiQDs–MoS2 was proposed, enabling sufficient photogenerated electrons and holes for the photocatalytic reactions. This study may establish a new frontier on the rational design and feasible development of the hybrid structures with the desirable morphologies, phase compositions and band structures for the catalysis and beyond.

Notes

Compliance with ethical standards

Conflicts of interest

This contribution has been approved by all coauthors, it has been published before, it is not under consideration for publication anywhere else, and there is no conflict of interest.

Supplementary material

10853_2018_2120_MOESM1_ESM.doc (8.6 mb)
Supplementary material 1 (DOC 8815 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Materials Chemistry, School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbinPeople’s Republic of China
  2. 2.The Academy of Fundamental and Interdisciplinary SciencesHarbin Institute of TechnologyHarbinPeople’s Republic of China
  3. 3.School of ScienceHIT Campus of University Town of ShenzhenShenzhenPeople’s Republic of China

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