Applications · Environmental sensing

Field detection of trace contaminants

Environmental monitoring has traditionally meant collecting samples and shipping them to a laboratory. Engineered nanomaterials can move the measurement to the river bank, the treatment plant or the field, in minutes rather than days.

ppt: Detection limit
9 min: Time to result
Battery: Field power requirement

Overview

Why delivery decides outcomes in environmental sensing

Clean water monitoring depends on detecting contaminants at concentrations far below the level that causes immediate harm. Metals such as lead, mercury, cadmium and arsenic, plus pesticides, pharmaceuticals and endocrine disruptors, need sensitivity in the parts-per-billion to parts-per-trillion range.

Nanomaterials make that sensitivity portable. Quantum dots fluoresce brightly and change colour or intensity when a target binds. Gold nanoparticles shift their plasmon resonance with distance, which turns them into colorimetric sensors visible to the eye. Magnetic nanoparticles concentrate trace analytes from large volumes before measurement.

The engineering challenge is selectivity in a complex matrix. A river sample contains organic matter, salts and competing ions that can swamp a sensor. Coatings, molecularly imprinted polymers and aptamers give the surface the ability to pick one molecule out of many.

Delivery barriers

What stands in the way

Matrix interference

Humic acids, metal ions and suspended solids change the signal. Sample clean-up or an internal reference channel is usually needed for reliable quantification.

Selectivity

A sensor that responds to any divalent metal is not useful. Selective binding chemistry, such as aptamers or imprinted polymers, decides whether the reading means anything.

Stability outside the lab

Temperature, sunlight and long storage degrade biological recognition elements. Inorganic nanomaterials are more robust than enzymes but still need protection.

Calibration and drift

Field instruments must be calibrated without laboratory standards. Self-referencing and ratiometric designs reduce drift and cut false positives.

Sensing mechanisms

Most nanomaterial sensors convert a binding event into an optical or electrochemical signal. Each mechanism trades sensitivity against simplicity and cost.

Fluorescence turn-on or turn-off with quantum dots and upconversion nanoparticles.
Colorimetric assays with gold nanoparticles that aggregate in the presence of the target.
Electrochemical sensing on carbon or gold electrodes modified with nanomaterials, using portable potentiostats.
Surface-enhanced Raman scattering for fingerprint identification of trace organics.
Magnetic capture and preconcentration before a second readout step.

What we measure

Heavy metals in drinking water and irrigation sources are the most mature application, because the regulatory limits are well defined and the chemistry is reliable. Ion-selective ligands on quantum dots give a visible change within minutes.

Endocrine-disrupting compounds, including bisphenol A, estradiol and certain pesticides, are harder because they are present at very low concentrations and vary structurally. Molecularly imprinted polymers designed around the target shape are the most promising recognition layer.

Pathogen and microbial monitoring is the fastest-growing area. Nucleic-acid sensing on nanoparticles can detect specific bacterial sequences without a full laboratory workflow.

From bench sensor to field instrument

A laboratory sensor becomes a useful product when the whole measurement chain is portable: sampling, mixing, reading and reporting. The chemistry is often the least difficult part.

We design assays for a handheld reader with a disposable cartridge, targeting a result in under ten minutes from a single drop or a few millilitres of water, and with enough stability that the cartridge survives a season in a vehicle.

Payloads

What gets delivered, and what it needs

Payload / chemistry	What it detects	Delivery consideration
Fluorescent quantum dots	Heavy metals, pH and dissolved oxygen	Surface coating decides selectivity and stability
Gold nanoparticles	Ions, pesticides and proteins by colour change	Stable colloid; concentration-dependent readout
Magnetic nanoparticles	Preconcentration of trace analytes	Easy separation with a magnet
Aptamer-functionalised particles	Specific small molecules and pathogens	Protect the aptamer from nucleases in water
Imprinted polymers	Endocrine disruptors and pharmaceuticals	Rebinding capacity after repeated use

How success is measured

Limit of detection and limit of quantification in real water matrices
Selectivity against structurally related interferents
Reproducibility across cartridges and operators
Stability after weeks of storage at ambient temperature
Agreement with laboratory reference methods such as ICP-MS

Browse the Assay Library →

Programmes in this area

BB-510
Multiplexed quantum-dot biomarker panel
Clinical · Cambridge Nanolab
BB-604
Point-of-care sepsis early-warning assay
Preclinical · In-house

See the full pipeline →

Other application areas

01 / Oncology →02 / Immunology & vaccines →03 / Neurology →04 / Rare disease →05 / Agricultural biotech →All applications

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