Opportunity
Pollution poses a severe global public health challenge, with hazardous contaminants in air and water requiring regular monitoring to ensure safety levels are not exceeded. Traditional chemical testing methods are often time-consuming and lack promptness, while highly accurate laboratory-based material characterization techniques are typically unsuitable for daily, low-cost, and rapid field applications. There is a significant unmet need for affordable, disposable, and highly sensitive sensors that can provide immediate detection of specific chemicals in both vapor and liquid phases for environmental monitoring, food safety, and public health protection.
Technology
The patent discloses an electrochemical detector comprising a plurality of receptors disposed on a semiconductor layer. The core innovation lies in the arrangement where these receptors are designed to selectively interact with a target substance (e.g., a specific pollutant or chemical in fluid, vapor, or liquid form), thereby altering an electrical characteristic of the underlying semiconductor layer. This interaction, often through chemical bonding such as hydrogen bonding, changes the current-voltage characteristic or electrical impedance of the semiconductor. The device typically includes electrodes on or above the semiconductor layer to facilitate measurement. The fabrication emphasizes simplicity and low cost, utilizing solution-based processes like spin coating or printing to deposit organic or metal oxide-based semiconductor and receptor layers, potentially on flexible substrates such as polyethylene terephthalate (PET). This thin-film, two-layer active structure enables scalable, roll-to-roll manufacturing.
Advantages
- Enables highly sensitive detection down to parts-per-billion (ppb) levels due to selective receptor-target interactions.
- Offers a simple, two-layer active structure that simplifies fabrication and enhances device yield and stability.
- Utilizes low-cost, solution-processable materials (e.g., organic semiconductors, functionalized receptors) and fabrication techniques (e.g., printing, spin coating).
- Facilitates large-scale, low-temperature manufacturing, suitable for roll-to-roll processes, making it ideal for producing disposable sensors.
- Can be fabricated on flexible substrates, allowing for versatile form factors and applications.
- Provides rapid response times compared to traditional laboratory methods.
- The design allows for customization by selecting different functionalized receptors to target a wide range of specific chemicals.
Applications
- Environmental monitoring for detecting air and water pollutants (e.g., toxic gases, chemical contaminants).
- Portable drug and alcohol detection devices for law enforcement and safety checks.
- Food and beverage quality control to detect spoilage indicators or contaminants.
- Industrial safety and leak detection for hazardous gases or chemicals.
- Medical diagnostics and point-of-care testing for specific biomarkers in bodily fluids.
- Homeland security and chemical threat detection.
