Graphene Quantum Dots for Near-Infrared Bioimaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current nanomaterials for drug/gene delivery and bioimaging face challenges due to high production costs, complex synthesis procedures, limited biocompatibility, and the need for UV/VIS excitation, which results in high autofluorescence background and low tissue penetration, making them unsuitable for in vivo applications.
Innovation Solution
Graphene quantum dots that emit in the near-infrared region in response to various excitation wavelengths, synthesized via top-down or bottom-up methods, offering scalable production, high biocompatibility, and reduced autofluorescence, allowing for effective bioimaging and drug delivery with improved tissue penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UV/VIS excitation is used for fluorescence tracking, then nanomaterials can be excited, but high autofluorescence background and low tissue penetration occur
Solution Approach 1:
The patent changes the emission wavelength parameter from UV/VIS to NIR region (700-1450 nm), which fundamentally alters the interaction with biological tissues. This parameter change reduces autofluorescence background and improves tissue penetration depth, resolving the contradiction between excitation capability and harmful effects
Solution Approach 2:
The patent uses carbon-based nanomaterials (graphene quantum dots, carbon dots) as inexpensive alternatives to expensive conventional nanomaterials like quantum dots and carbon nanotubes. These carbon-based materials provide NIR emission without the toxicity and complexity associated with heavier materials, effectively replacing them while maintaining or improving performance
2Reliability
If conventional nanomaterials are used for fluorescence tracking, then emissions can be achieved, but complex synthesis procedures and high production costs occur
Solution Approach 1:
The patent employs carbon-based nanomaterials that can be synthesized through simple, scalable methods such as hydrothermal treatment of carbon sources. This approach eliminates the need for complex multi-step syntheses and expensive precursors required for conventional quantum dots, significantly reducing production costs while maintaining reliable NIR fluorescence emission
Solution Approach 2:
The patent changes the material composition parameter from heavy metal-based quantum dots to carbon-based nanomaterials. This parameter change simplifies the synthesis process, reduces production costs, and eliminates the need for complex purification steps while preserving the desired fluorescence properties
3Illumination intensity
If SWCNTs are used for NIR emission, then NIR-I and NIR-II region emissions are achieved, but biocompatibility issues and immunogenic responses occur
Solution Approach 1:
The patent replaces carbon nanotubes with carbon-based nanomaterials (graphene quantum dots, carbon dots) that exhibit similar or superior NIR fluorescence properties. These alternative carbon materials demonstrate better biocompatibility and reduced immunogenicity, effectively substituting the problematic SWCNTs while maintaining the desired optical properties
4Reliability
If PbS/CdS/CdSe quantum dots are used for NIR I/II emission, then in-vitro/in-vivo NIR fluorescence tracking is achieved, but environmental detriment and biotoxicity occur
Solution Approach 1:
The patent substitutes heavy metal-based quantum dots (PbS, CdS, CdSe) with carbon-based nanomaterials that provide comparable or enhanced NIR fluorescence performance. The carbon-based alternatives are environmentally benign and non-toxic, eliminating the harmful effects associated with heavy metals while maintaining reliable in-vitro and in-vivo imaging capabilities
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 graphene quantum dots provide efficient near-infrared fluorescence for bioimaging with reduced background interference, enhanced biocompatibility, and the ability to accumulate and excrete quickly, making them suitable for in vivo applications without the need for additional contrast agents, thus addressing the limitations of existing nanomaterials.
Implementation Method 1
graphene quantum dots which exhibit fluorescence in the near infrared regions in response to various excitation wavelengths
Data Source
AI summary
The present disclosure comprises graphene quantum dots that exhibit emission in the near-infrared region in response to a variety of excitation wavelengths. The exciting wavelengths may be in the visible region, near-infrared region, or both. The quantum dots may be synthesized via a top-down method or a bottom-up method. The quantum dots are useful in imaging, drug delivery, and biosensing. The quantum dots comprise carbon, oxygen, hydrogen, nitrogen, and metal atoms in various combinations.