Nanofibrous Gold Nanoparticle Sweat Sensor for Flexible Selectivity

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Solution Overview

Problem

Existing sweat sensors lack multifunctionality, biocompatibility, flexibility, and sensitivity, and are costly to manufacture, making them inadequate for continuous monitoring of sweat components such as ions and biomarkers.

Innovation Solution

A nanocomposite scaffold is constructed using gold nanoparticles assembled in a multilayered nanofibrous membrane through molecular linking and electrostatic binding, featuring a three-layer structure of cellulose nanofibers, polyacrylonitrile, and polyethylene terephthalate, with molecular linkers like 11-mercaptoundecanoic acid or poly(diallyl ammonium) for anchoring nanoparticles, enabling tunable sensitivity and selectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional sweat sensor materials are used, then manufacturing cost is reduced, but sensitivity and selectivity are insufficient

Engineering Contradiction:

ImprovesensitivityVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent employs composite materials by combining gold nanoparticles with nanofibrous membrane scaffolds (cellulose, polyacrylonitrile, polyethylene terephthalate) to create a sensor that achieves high sensitivity and selectivity for sweat component detection while maintaining manufacturing feasibility through established nanomaterial synthesis and assembly techniques

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If rigid sensor structures are used, then manufacturing precision is improved, but flexibility and wearability are reduced

Engineering Contradiction:

ImproveflexibilityVSAvoidstructural stability

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent utilizes flexible thin film structures by incorporating nanofibrous membranes with controlled porosity and mechanical properties that allow the sensor to conform to skin surfaces while maintaining structural integrity for precise measurements during wear

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The sensor is divided into multiple functional layers including nanofibrous membrane layers, gold nanoparticle layers, and substrate layers, each optimized for specific functions while collectively providing both flexibility and manufacturing precision through modular assembly

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If single-function sensor designs are used, then device complexity is reduced, but multifunctionality is insufficient

Engineering Contradiction:

ImprovemultifunctionalityVSAvoidsensor structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent creates a universal sensor platform where gold nanoparticles on nanofibrous membranes can detect multiple sweat components including ions, moisture, and biomarkers simultaneously, enabling a single device structure to perform multiple sensing functions through the inherent properties of the nanocomposite material

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 nanocomposite scaffold provides flexible, wearable sensors with enhanced sensitivity and selectivity for detecting sweat components, offering low-cost manufacturing and maintaining close contact with the skin for rapid response.

Implementation Method 1

assembled in a multilayered nanofibrous membrane through molecular linking and electrostatic binding

Methodology Applied

Scientific EffectElectrostatic binding: Electrostatics

Implementation Method 2

assembled in a multilayered nanofibrous membrane through molecular linking and electrostatic binding

Methodology Applied

Scientific EffectMolecular linking: Chemical Bonding

Data Source

PatentUS12605093B2Nanoparticle sensor having a nanofibrous membrane scaffold

Publication Date: 2026.04.21 THE RES FOUNDATION FOR THE STATE UNIV OF NEW YORK

AI summary

Nanoparticle-fibrous membrane composites are provided as tunable interfacial scaffolds for flexible chemical sensors and biosensors by assembling gold nanoparticles (Au NPs) in a fibrous membrane. The gold nanoparticles are functionalized with organic, polymeric and/or biological molecules. The fibrous membranes may include different filter papers, with one example featuring a multilayered fibrous membrane consisting of a cellulose nanofiber (CN) top layer, an electrospun polyacrylonitrile (PAN) nanofibrous midlayer (or alternate material), and a non-woven polyethylene terephthalate (PET) fibrous support layer, with the nanoparticles provided on the fibrous membranes through interparticle molecular/polymeric linkages and nanoparticle-nanofibrous interactions. Molecular linkers may be employed to tune hydrogen bonding and electrostatic and/or hydrophobic/hydrophilic interactions to provide sensor specificity to gases or liquids. The sensors act as chemiresistor-type sensors. A preferred implementation is a sweat sensor.