Single-Crystal Spherical Silicon Nanoparticles for Broad-Spectrum Fluorescence
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Solution Overview
Problem
Existing methods for producing silicon nanoparticles result in polycrystalline or non-spherical particles, and they either produce fluorescence in narrow wavelength ranges or require costly and hazardous chemicals, limiting their industrial application and efficiency.
Innovation Solution
Production of monocrystalline and spherical silicon nanoparticles with a diameter of 1-20 nm, utilizing a fluid processing apparatus to mix silicon tetrachloride with a metal lithium and condensed aromatic compound at controlled temperatures to suppress grain boundaries and stabilize the particles, enhancing fluorescence efficiency across a wide wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods (acid treatment, laser irradiation, reducing agents) are used to produce silicon nanoparticles, then particle production is achieved, but the particles are polycrystalline or non-spherical with narrow fluorescence wavelength ranges
Solution Approach 1:
The invention changes the reaction parameters by conducting the reduction reaction at controlled temperatures (0°C to 25°C) and specific pH conditions, which transforms the product from polycrystalline to monocrystalline structure while maintaining spherical shape and broad fluorescence wavelength range
Solution Approach 2:
The invention replaces mechanical/chemical processing methods (acid treatment, laser irradiation) with a controlled chemical reduction process using silane compounds and hydrogen sources, directly producing monocrystalline spherical nanoparticles without grain boundaries
2Manufacturing precision
If acid substances (hydrofluoric acid, nitric acid) are used to produce silicon nanoparticles, then particle purification is achieved, but handling complexity and safety risks increase
Solution Approach 1:
The invention replaces hazardous acid substances with safer, more manageable reagents (silane compounds, hydrogen sources) that can be handled under standard laboratory conditions, eliminating the need for specialized acid handling procedures while maintaining particle purity
Solution Approach 2:
The invention introduces controlled reaction conditions (temperature control, pH adjustment) as intermediaries to achieve particle purification without direct use of hazardous acids, using milder chemical agents that facilitate the same purification outcome with improved safety
3Manufacturing precision
If laser irradiation methods are used to produce silicon nanoparticles, then monocrystalline structure is achieved, but production cost increases due to equipment requirements
Solution Approach 1:
The invention replaces expensive laser irradiation equipment with simple chemical reduction reactions using silane compounds and hydrogen sources, achieving the same monocrystalline structure formation through controlled chemical processes that can be performed with standard laboratory equipment
Solution Approach 2:
The invention uses inexpensive chemical reagents (silane compounds, hydrogen sources) instead of expensive laser equipment, making the production process economically viable while maintaining high crystalline structure quality through controlled reaction conditions
4Productivity
If reducing agents are used to produce silicon nanoparticles, then particle formation is achieved, but polycrystalline structure and narrow fluorescence range result
Solution Approach 1:
The invention optimizes reaction parameters including temperature (0°C to 25°C), pH conditions, and reagent concentrations to control the reduction process, transforming the outcome from polycrystalline to monocrystalline structure while maintaining high particle formation efficiency
Solution Approach 2:
The invention creates localized controlled reaction conditions at the nanoscale through precise control of reactant diffusion and reaction zones, ensuring uniform monocrystalline growth from the core outward while maintaining overall spherical shape and structural uniformity
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 monocrystalline silicon nanoparticles achieve high fluorescence quantum efficiency from deep ultraviolet to visible light, suitable for electrode materials in solar cells and batteries, with improved stability and safety compared to cadmium or tellurium compounds.
Implementation Method 1
mixing a liquid containing a raw material of the single-crystal spherical silicon nanoparticles and a reduction liquid containing metal lithium and a condensed aromatic compound
Implementation Method 2
at a temperature of 0° C. or less, mixing a liquid containing a raw material of the single-crystal spherical silicon nanoparticles and a reduction liquid containing metal lithium and a condensed aromatic compound in a thin film fluid formed between two processing surfaces arranged to be opposite to each other, at least one of which rotates relative to the other
Implementation Method 3
the single-crystal spherical silicon nanoparticles of the present invention can produce blue to orange fluorescence at a high fluorescence quantum efficiency upon excitation by light in a wide range of wavelengths from deep ultraviolet light having a wavelength of 200 nm to 300 nm to visible light
Data Source
AI summary
The present disclosure relates to single-crystal spherical silicon nanoparticles which are monocrystalline are spherical and have an average particle diameter of 1 nm to 20 nm as well as a method of producing the same. The single-crystal spherical silicon nanoparticles of the present invention can produce fluorescence at a high fluorescence quantum efficiency upon excitation by light in a wide range of wavelengths from deep ultraviolet light having a wavelength of 200 nm to 300 nm to visible light, and can increase the conventionally known fluorescence quantum efficiency of silicon nanoparticles from around 1% to 10% or more.