Nano-object Attachment via Beam-Induced Linker Groups
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Solution Overview
Problem
Existing methods for assembling nano-objects into macroscopic arrays are limited by weak bonding to substrates, preventing further processing steps like wet chemistry or lithography, which are necessary for device applications such as microfluidic devices and biosensing.
Innovation Solution
Beam-induced deposition creates precise attachment positions on a surface by decomposing precursor materials, allowing for the formation of linker groups that enable robust, covalent bonding of nano-objects, such as nanodiamonds or bio-molecules, directly to the modified surface without the need for gold application or self-assembled monolayers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lithographic techniques or self-assembled monolayers are used to assemble nano-objects, then high resolution patterning is achieved, but the bonding strength to substrate is weak and further processing cannot be performed
Solution Approach 1:
The patent segments the assembly process into distinct stages: first forming a self-assembled monolayer for high-resolution patterning, then depositing a separate metallic layer (gold, silver, aluminum) that provides strong bonding. This segmentation allows each layer to fulfill its specific function without compromise.
Solution Approach 2:
The patent creates a composite structure combining organic self-assembled monolayer molecules with inorganic metallic layers. The monolayer provides patterning precision while the metal layer provides bonding strength, allowing the system to achieve both high resolution and strong adhesion simultaneously.
2Reliability
If gold application and self-assembled monolayer formation are used for bio-molecule immobilization, then selective binding is achieved, but the process becomes time consuming and expensive
Solution Approach 1:
The patent performs preliminary action by pre-forming self-assembled monolayers with terminal groups designed for specific bio-molecule binding. This preliminary functionalization allows rapid, selective immobilization of target molecules without requiring time-consuming trial-and-error optimization during the actual bio-molecule attachment step.
Solution Approach 2:
The patent changes the chemical parameters of the self-assembled monolayer terminal groups to match the target bio-molecule characteristics. By selecting appropriate terminal functional groups (amino, carboxyl, hydroxyl, etc.), the system achieves high selectivity and binding efficiency, reducing the need for repeated processing steps.
3Ease of manufacture
If direct surface immobilization is used for bio-molecules, then processing steps are simplified, but the bio-molecules can be irreversibly denatured by interaction with the substrate surface
Solution Approach 1:
The patent introduces self-assembled monolayers as intermediary layers between the substrate surface and bio-molecules. These monolayers act as protective mediators that prevent direct contact between bio-molecules and the substrate, avoiding denaturation while maintaining process simplicity. The terminal groups of the monolayers provide gentle, selective binding environments for bio-molecules.
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 method provides precise, selective, and robust attachment of nano-objects, enabling them to withstand subsequent processing steps like sonication and allowing for their use in sensitive applications without disrupting the structure of bio-molecules.
Implementation Method 1
Beam-induced deposition decomposes a precursor at precise positions on a surface
Implementation Method 2
The sample is processed to provide linker groups on the surface of the deposit
Implementation Method 3
the sample is processed to attach nano-objects to the linker groups
Data Source
Figure 1~2B
Figure 3~4
Figure 5~6
AI summary
Beam-induced deposition decomposes a precursor at precise positions on a surface. The surface is processed to provide linker groups on the surface of the deposit, and the sample is processed to attach nano-objects to the linker groups. The nano-objects are used in a variety of application. When a charged particle beam is used to decompose the precursor, the charged particle beam can be used to form an image of the surface with the nano-objects attached.