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467 results on '"Ho, Ghim Wei"'

18. Ligand Mediated Assembly of CdS Colloids in 3D Porous Metal–Organic Framework Derived Scaffold with Multi‐Sites Heterojunctions for Efficient CO2 Photoreduction.

Author

Zhang, Tianxi, Li, Tongtao, Gao, Minmin, Lu, Wanheng, Chen, Zongwei, Ong, Wei Li, Wong, Andrew See Weng, Yang, Liming, Kawi, Sibudjing, and Ho, Ghim Wei

Subjects
LIGANDS (Chemistry), METAL-organic frameworks, SEMICONDUCTOR nanocrystals, COLLOIDS, QUANTUM dots, COLLOIDAL crystals, MOLECULAR recognition, MOLECULAR self-assembly, CHARGE transfer
Abstract

The inclusion of colloidal particles into 3D porous constructs to realize heterostructure ensembles enhances surface interactions and energy transfer that can transform the catalytic properties of conventional catalysts. However, assembling hydrophobic colloidal nanoparticles within hydrophilic 3D porous matrices to create tailored heterostructures and catalytic properties is particularly challenging. Here, a modified ligand grafting method is presented to spontaneously assemble CdS inorganic colloidal quantum dots within a metal‐organic framework (MOF) derived porous framework for efficient photocatalytic CO2 reduction. The grafted long chain molecular ligands effectively suppress phase separation and endow a molecular‐recognition effect to form ordered assembly microstructures. The proof‐of‐concept assembly of CdS and Prussian blue analogues (PBA) derived Co3O4 facilitates a high density of heterojunctions formation, improving charge transfer and extended lifetimes of photo‐induced electrons. Consequently, CdS/Co3O4 assembly exhibits exceptionally active and stable photocatalytic CO2 reduction activity, with a CO production rate of 73.9 µmol g−1 h−1 and CO selectivity of 98.9%. Importantly, the ligand grafting method can be generalized to achieve spontaneous assembly of quantum dots within various metal organic framework derived porous scaffolds. This work provides a rational strategy for precise self‐assembly of colloidal nanoparticles within porous microstructures, allowing tailored heterointerfaces for functional materials and applications. [ABSTRACT FROM AUTHOR]

Published
2024
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25. Strain effects on work functions of pristine and potassium-decorated carbon nanotubes

Author

Cai, Yongqing, Zhang, Aihua, Feng, Yuan Ping, Zhang, Chun, Teo, Hao Fatt, and Ho, Ghim Wei

Subjects
Condensed Matter - Materials Science
Abstract

Strain dependence of electronic structures and work functions of both pristine and potassium doped (5,5) (armchair) and (9,0) (zigzag) carbon nanotubes (CNTs) has been thoroughly studied using first-principles calculations based on density functional theory (DFT). We found that for pristine cases, the uniaxial strain has strong effects on work functions of CNTs, and the responses of work functions of CNT (5,5) and (9,0) to the strain are distinctly different. When the strain changes from -10% to +10%, the work function of the CNT (5,5) increases monotonically from 3.95 eV to 4.57 eV, and the work function of the (9,0) varies between 4.27 eV and 5.24 eV in a complicated manner. When coated with potassium, for both CNTs, work functions can be lowered down by more than 2.0 eV, and the strain dependence of work functions changes drastically. Our studies suggested that the combination of chemical coating and tuning of strain may be a powerful tool for controlling work functions of CNTs, which in turn will be useful in future design of CNT-based electronic and field-emitting devices.

Published
2011

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