Plasmonic Substrate with Uniform Nanoscale Roughness

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Solution Overview

Problem

Current photocatalytic hydrogen production methods face low efficiencies due to non-uniform electromagnetic field enhancements on nanostructured metal substrates, which hinder the reproducible and scalable production of hydrogen.

Innovation Solution

A plasmonic substrate with a metallic film exhibiting uniform nanoscale roughness, created through a multilayered metal template and Galvanic rearrangement, is combined with a semiconducting photocatalyst to enhance electromagnetic field enhancements and improve hydrogen production rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a plasmonic substrate with uniform nanoscale roughness is used, then electromagnetic field enhancement consistency is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveuniformity of electromagnetic field enhancementVSAvoidsubstrate structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The substrate is divided into multiple functional layers: a base layer, an intermediate metal layer with controlled roughness (10-200 nm RMS), and a photocatalyst layer. This segmentation allows each layer to be optimized independently for its specific function, achieving uniform electromagnetic field enhancement through the intermediate layer's controlled nanoscale roughness while keeping the overall device manageable through modular construction

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent controls the RMS roughness parameter of the intermediate metal layer within a specific range (10-200 nm) to achieve optimal and uniform electromagnetic field enhancement. By precisely controlling this physical parameter through physical vapor deposition techniques, the patent achieves consistent plasmonic effects across the substrate surface without requiring complex structural modifications

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional photocatalytic methods are used, then system simplicity is maintained, but hydrogen production efficiency remains low

Engineering Contradiction:

Improvehydrogen production efficiencyVSAvoidsubstrate structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent employs a composite substrate structure combining metal layers with controlled nanoscale roughness and photocatalyst materials. This composite structure leverages the plasmonic properties of the metal intermediate layer to enhance electromagnetic field distribution, which in turn boosts the photocatalytic activity of the overlying catalyst layer, achieving significantly improved hydrogen production efficiency compared to conventional flat substrates

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The intermediate metal layer is engineered with uniform nanoscale roughness (10-200 nm RMS), creating curved and irregular surface features at the nanoscale. This surface curvature generates localized electromagnetic field enhancements through plasmonic effects, increasing the overall photocatalytic efficiency without requiring complex macroscopic structural changes

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 uniform nanoscale roughness of the metallic film provides consistent electromagnetic field enhancements across the substrate, increasing the photocatalytic conversion rate and hydrogen production efficiency by improving light absorption and charge separation.

Implementation Method 1

Rough nanostructured metal surfaces may impart electromagnetic field enhancements and injection of hot electrons, thereby increasing hydrogen production in photocatalytic processes.

Methodology Applied

Scientific EffectPlasmonic effect:

Implementation Method 2

The present disclosure relates to a photocatalytic substrate having a nanostructured surface morphology and a fabrication method to make said substrate

Methodology Applied

Scientific EffectGalvanic rearrangement:

Implementation Method 3

The photocatalytic process offers one such pathway that utilizes sunlight and water to directly produce hydrogen through the water splitting reaction utilizing a photocatalyst.

Methodology Applied

Scientific EffectPhotocatalysis:

Data Source

PatentUS20250092545A1Plasmonic substrate for plasmonic enhancement

Publication Date: 2025.03.20 SAUDI ARABIAN OIL CO

AI summary

A plasmonic substrate includes a base, a metallic film on the base, and a semiconducting photocatalyst on the metallic film. A method for producing a plasmonic substrate includes depositing a first metal layer having a thickness ranging from 10 to 200 nm and having a first metal through a physical vapor deposition technique onto a base, depositing a second metal layer having a second metal through a physical vapor deposition technique onto the first metal layer forming a multilayered metal template, immersing the multilayered metal template into a solution having a salt or complex of the second metal for a period of time forming a metallic film, and depositing a semiconducting photocatalyst on the metallic film. A method of catalyzing hydrogen production includes immersing a plasmonic substrate in a photocatalytic solution, exposing the plasmonic substrate to light, and generating hydrogen at a surface of the semiconducting photocatalyst.