Metal-Coated Nanowire Bundle Array for Broadband Solar Absorption
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Solution Overview
Problem
Conventional surface plasmon resonance heating methods have a narrow absorption band due to resonance characteristics, limiting the efficiency of converting broad solar spectra into heat for steam generation.
Innovation Solution
A nanowire bundle array with nanowires coated in a thin metal film, arranged in a funnel structure with decreasing widths and spaced at nanoscale intervals, enhances light absorption from visible to infrared wavelengths, utilizing capillary forces and a porous support for efficient heat conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional surface plasmon resonance heating methods are used, then heating efficiency is improved, but the absorption band becomes narrow
Solution Approach 1:
The structure is segmented into multiple nanowire assemblies with different geometries (varying heights, widths, and spacing) to create multiple resonance modes. Each nanowire assembly resonates at different frequencies, collectively covering a broad spectrum from visible to infrared light, thus resolving the narrow absorption band problem while maintaining high heating efficiency
Solution Approach 2:
Different regions of the nanowire array have locally optimized properties - nanowires at different positions have different dimensions and orientations. This local variation in geometric quality enables each region to absorb specific wavelength ranges, collectively achieving broadband absorption across the solar spectrum
2Reliability
If nanowire bundle array with metal-coated nanowires is used, then light absorption rate increases, but manufacturing complexity increases
Solution Approach 1:
The nanowire bundle array structure enables self-binding through capillary forces during fabrication. The nanowires automatically assemble and bind to each other without requiring complex external assembly processes, reducing manufacturing complexity while maintaining high light absorption rates through the metal coating
Solution Approach 2:
The structure combines dielectric nanowire cores with metal coatings to create composite nanowires. This composite material approach achieves superior light absorption through plasmonic effects while the core provides structural support, balancing performance requirements with manufacturability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The nanowire bundle array achieves high light absorption and low reflection rates, effectively converting broad solar spectra into heat for efficient steam generation, improving the performance of solar energy conversion systems.
Implementation Method 1
it has been known that, upon localized surface plasmon resonance heating, lights of metal nanoshells or nanoparticles are not reflected and the lights are trapped, whereby heating is carried out
Implementation Method 2
lights of metal nanoshells or nanoparticles are not reflected and the lights are trapped, whereby heating is carried out
Implementation Method 3
the nanowire may be bound to any one of the nanowires included in the nanowire assembly by capillary force of a liquid present between the nanowires
Data Source
AI summary
Disclosed is a nanowire bundle array. Particularly, the nanowire bundle array according to an embodiment of the present disclosure includes a plurality of nanowire assemblies arranged therein. Each of the nanowire assemblies includes nanowires, a surface of at least a portion of which is coated with a thin metal film and the widths between the nanowires gradually decrease from one end to another end.