Semiconductor Core Shell Nanoparticles via Molecular Cluster Templates

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Solution Overview

Problem

Current methods for synthesizing semiconductor nanoparticles face challenges in achieving uniformity, size distribution, and long-term chemical and photostability, particularly at larger scales needed for commercial applications, due to temperature differentials and limitations in precursor compositions that restrict the range of materials that can be produced.

Innovation Solution

The method involves using molecular clusters as templates to direct nanoparticle growth, maintaining their structural integrity, and employing a core/shell or core/multi-shell structure with a metal oxide layer to enhance stability and functionality, allowing for the production of semiconductor/metal oxide core/shell quantum dots with improved robustness and optical properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional colloidal aqueous chemistry or kinetically controlled precipitation methods are used, then nanoparticle synthesis can be achieved, but manufacturing precision and uniformity deteriorate at larger scales due to temperature differentials

Engineering Contradiction:
Improvescale of productionVSAvoiduniformity and size distribution
Core Design Contradiction:
ProductivityVSManufacturing precision

Solution Approach 1:

The patent introduces molecular cluster compounds as intermediary templates that mediate between the bulk solution and the nanoparticle formation process. These clusters provide uniform nucleation sites throughout the solution, ensuring consistent nanoparticle size and distribution even at large scales, thereby resolving the contradiction between productivity and manufacturing precision.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs preliminary action by using pre-formed molecular cluster compounds as templates before nanoparticle synthesis begins. These clusters are prepared in advance and distributed uniformly throughout the solution, establishing consistent nucleation sites before the actual particle formation occurs, thus maintaining uniformity and size distribution at large scales.

Inventive Principle:
Principle #10Preliminary action

2Adaptability or versatility

If precursor compositions are limited to conventional types, then synthesis simplicity is maintained, but adaptability deteriorates due to restricted material range

Engineering Contradiction:
Improverange of materials that can be producedVSAvoidcomplexity of precursor compositions
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies universality by using molecular cluster compounds as multi-functional templates that can direct the formation of various nanoparticle materials (semiconductor cores, metal oxide shells, etc.). These universal templates enable the synthesis of different material compositions and structures without requiring separate specialized precursors for each, thereby increasing adaptability while managing complexity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent employs composite materials by combining molecular cluster templates with various precursor compositions to create core/shell and multi-shell nanoparticle structures. This approach allows access to a wide range of material combinations (e.g., semiconductor cores with metal oxide shells) while using a unified template-based methodology, thus enhancing versatility without proportionally increasing complexity.

Inventive Principle:
Principle #40Composite materials

3Reliability

If single core semiconductor nanoparticles with organic passivation are used, then synthesis simplicity is maintained, but reliability deteriorates due to low quantum efficiencies from surface defects

Engineering Contradiction:
Improvequantum efficiencyVSAvoidstructure complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies the nested doll principle by creating core/shell and core/multi-shell nanoparticle structures where smaller functional layers are nested within a larger framework. The semiconductor core is nested within protective and functional shell layers (e.g., metal oxide shells), which in turn may contain additional functional layers. This nested structure eliminates surface defects and dangling bonds while maintaining manageable complexity through systematic layering.

Inventive Principle:
Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent uses composite materials by combining semiconductor cores with metal oxide shells and additional functional layers to create core/shell and multi-shell structures. These composite structures eliminate surface defects and dangling bonds that cause non-radiative recombination, thereby improving quantum efficiency and reliability while managing complexity through systematic material combination.

Inventive Principle:
Principle #40Composite materials

4Manufacturing precision

If molecular clusters are used as templates, then manufacturing precision is improved through well-defined nucleation sites, but device complexity increases

Engineering Contradiction:
Improveuniformity and size distributionVSAvoidcomplexity of synthesis method
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent uses molecular cluster compounds as intermediary templates that simplify the synthesis process by providing uniform nucleation sites. These intermediaries mediate between the bulk solution and nanoparticle formation, ensuring consistent size and distribution without requiring complex control mechanisms, thus improving precision while managing methodological complexity.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies self-service by using molecular cluster templates that automatically direct nanoparticle formation in a self-organizing manner. The clusters self-assemble and guide the deposition of precursor materials into uniform nanoparticles, eliminating the need for complex external control systems and thereby improving manufacturing precision while keeping the synthesis method relatively simple.

Inventive Principle:
Principle #25Self-service

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

This approach enables the production of high-quality, monodispersed nanoparticles with enhanced stability and functionality, suitable for commercial applications, by providing well-defined nucleation sites and using metal oxide layers to improve resistance to chemical environments and fluorescence quenching.

Implementation Method 1

using molecular clusters as templates to direct nanoparticle growth, maintaining their structural integrity

Methodology Applied
Scientific EffectNucleation: Nucleation

Implementation Method 2

employing a core/shell or core/multi-shell structure with a metal oxide layer to enhance stability and functionality

Methodology Applied
Scientific EffectDeposition: Deposition (physical)

Implementation Method 3

Core-shell particles separate any carriers confined in the core from surface states that would otherwise act as non-radiative recombination centres

Methodology Applied
Scientific EffectQuantum confinement: Potential Well

Implementation Method 4

improve resistance to chemical environments and fluorescence quenching

Methodology Applied
Scientific EffectFluorescence: Fluorescence

Data Source

PatentEP2341117B1Core shell nanoparticles
Publication Date: 2016.04.06 NANOCO TECH LTD
  • EP2341117B1 patent drawingFigure 1~2
  • EP2341117B1 patent drawingFigure 3~4
  • EP2341117B1 patent drawingFigure 5~6

AI summary

A nanoparticle comprising a core comprised of a first material and a layer comprised of a second material. The first material is a semiconductor material incorporating ions from groups 12 and 16 of the periodic table or ions from groups 13 and 15 of the periodic table. The second material is an oxide of a metal selected from group 8 of the periodic table.