We specialize in evaluating gas-sensing materials such as metal oxides (e.g., ZnO, SnO₂, TiO₂), composites, and 2D materials like graphene.
Sensing Properties Analysis
At Photon Center, we offer advanced characterization of sensing properties for functional materials and sensor devices. Our lab specializes in evaluating gas sensors, photodetectors, biosensors, and chemical sensors based on nanomaterials, metal oxides, polymers, and hybrid structures.
This service is essential for researchers and engineers working on smart sensors, wearable devices, environmental monitoring, industrial safety, and healthcare diagnostics.
Core Sensing Parameters We Analyze:
Sensitivity (S)
Measures how strongly a material or device responds to the presence of a target analyte (gas, light, humidity, etc.). Defined as the change in resistance, current, or voltage relative to the stimulus.
Selectivity
The sensor’s ability to differentiate between multiple analytes — for example, distinguishing between CO, NO₂, NH₃, and H₂ in gas sensing applications.
Response Time (τ₁)
The time required for the sensor signal to reach 90% of its full change after exposure to the target.
Recovery Time (τ₂)
The time needed to return to baseline after removal of the stimulus.
Limit of Detection (LOD)
The lowest concentration of an analyte that can be reliably detected by the sensor.
Stability and Repeatability
Evaluation of performance over repeated cycles, and under long-term operation or varying environmental conditions (humidity, temperature, light).
Controlled gas exposure testing for VOCs, CO, NO₂, H₂, NH₃, and more
Sensitivity and selectivity measurement under dry and humid conditions
Real-time resistance and current monitoring
Temperature-dependent behavior analysis (room temperature to high-temp sensing)
Dynamic testing for response/recovery evaluation
Gas sensor testing is performed using custom test chambers with precise gas flow control and real-time data acquisition.
🧪 Gas Sensor Testing & Analysis
We provide comprehensive electrical characterization of gas sensing materials and devices, including:
✔️ Supported Gas Types:
VOCs (e.g., ethanol, acetone, methanol)
Industrial gases (e.g., CO, NO, NO₂, SO₂)
Reducing gases (e.g., H₂, NH₃, CH₄)
Oxygen and ozone (O₂, O₃)
Moisture and humidity sensing (H₂O vapor)
✔️ Testing Capabilities:
Dynamic gas exposure setup with controlled flow rate (ppm to % range)
Real-time resistance/current monitoring (in chemoresistive or conductometric mode)
Temperature-controlled testing (room temp up to 400 °C)
Humidity control for cross-sensitivity and selectivity studies
Repeatability & long-term drift testing
Sensor array testing (multi-channel) for data fusion and AI-based selectivity enhancement
✔️ Materials We Support:
Metal oxides (e.g., SnO₂, ZnO, TiO₂, In₂O₃)
2D materials (e.g., graphene, MoS₂, rGO)
Perovskite-based sensors
Organic/inorganic hybrids
Doped or functionalized nanomaterials