Ag-In-Se Nanoparticles for Near-Infrared Bioimaging
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Solution Overview
Problem
Current bioimaging techniques face challenges in achieving high-resolution biological information due to the lack of strong light emission in the near-infrared region, particularly within the 'biological window' of 700 to 1400 nm, where the emission spectrum is not steep and sharp enough, leading to inferior resolution and difficulty in obtaining desired biological information.
Innovation Solution
The development of Ag—In—Se based compound semiconductor nanoparticles with a chalcopyrite crystal structure, where the peak wavelength of emission intensity is controlled within 700 to 1400 nm and the half-value width is kept at 100 nm or less, utilizing a method that involves preparing Ag—In precursor and Se precursor solutions, heating them to improve crystallinity and suppress defect generation, thereby achieving band-edge luminescence with reduced energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light emitters are used in bioimaging, then the imaging process is simple and safe, but the light emission intensity is insufficient and the resolution is inferior
Solution Approach 1:
The patent changes the material composition parameters of the light emitter by using Ag-In-Se compound semiconductors with specific atomic ratios (Ag:In:Se = 1:1:2 or Ag:In:Se = 1:2:4), which fundamentally alters the optical properties to achieve strong near-infrared emission with narrow half-value width, thereby simultaneously improving emission intensity and measurement precision
Solution Approach 2:
The patent employs composite material design by combining Ag, In, and Se elements in specific ratios to create Ag-In-Se compound semiconductor nanoparticles with chalcopyrite crystal structure, which exhibits superior optical properties including strong near-infrared emission and narrow emission spectrum, resolving the contradiction between emission intensity and resolution
2Measurement precision
If the emission spectrum is not steep and sharp, then the light emitter can be easily manufactured, but the biological information resolution is inferior
Solution Approach 1:
The patent achieves sharp emission spectrum through precise control of material composition parameters (Ag:In:Se ratios) and particle size parameters (5-50 nm), which quantum confinement effects to produce narrow half-value width emission spectra, thereby achieving high biological information resolution without compromising manufacturability
Solution Approach 2:
The patent applies local quality principle by optimizing the crystal structure at the nanoscale level, creating chalcopyrite structure with specific local atomic arrangements that produce steep and sharp emission spectra, enabling high resolution while maintaining ease of manufacture through solution-based synthesis
3Illumination intensity
If Ag-In-Se compound semiconductor nanoparticles are used, then strong near-infrared luminescence is achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent simplifies manufacturing by optimizing the synthesis parameters including reaction temperature (200-300°C), reaction time (0.5-2 hours), and precursor ratios, which enables controlled formation of Ag-In-Se nanoparticles with desired optical properties through straightforward hydrothermal or solvothermal processes, maintaining ease of manufacture while achieving strong near-infrared luminescence
Solution Approach 2:
The patent utilizes the relationship between particle size and emission wavelength (quantum confinement effect) to tune the near-infrared emission characteristics, allowing control of emission peak position and intensity through size control during synthesis, thereby achieving strong luminescence with relatively simple manufacturing by adjusting size parameters
4Manufacturing precision
If the half-value width is not controlled to 100 nm or less, then the manufacturing process is simpler, but the emission spectrum is not steep and sharp enough
Solution Approach 1:
The patent achieves narrow half-value width (≤100 nm) by precise control of composition parameters (Ag:In:Se ratios) and size parameters (5-50 nm) during synthesis, which quantum effects to produce steep emission spectra, while maintaining ease of manufacture through solution-based methods that naturally control size distribution, balancing manufacturing precision with production simplicity
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 results in a light emitter capable of producing strong, high-resolution luminescence in the near-infrared region, suitable for bioimaging, allowing for dynamic analysis of biological images with high sensitivity and multiple colors, effectively addressing the limitations of existing bioimaging techniques.
Implementation Method 1
through light absorption, electrons and holes are recombined to produce luminescence
Implementation Method 2
achieving band-edge luminescence with reduced energy loss
Implementation Method 3
heating them to improve crystallinity and suppress defect generation
Implementation Method 4
heating the mixed solution at a reaction temperature higher than the predetermined temperature for a predetermined period of reaction time
Data Source
AI summary
A light emitter is formed from nanoparticles including a compound semiconductor containing an Ag component, In component, and Se component. The peak wavelength of the emission intensity falls within the range of 700 to 1400 nm, and the half-value width ΔH for the peak wavelength is 100 nm or less. The light emitted is configured to emit strong light in the near-infrared region, and which is capable of detecting biological information, and is preferred for bioimaging.