Paper titanyl sensor sees H2O2 vapor at 0.04 ppb
Ammonium titanyl oxalate on cellulose turns yellow as a Ti(IV)–peroxide complex, detecting hydrogen peroxide vapor down to about 0.04 ppb without fancy instrumentation.
Source
Designing Tunable Paper-Based Colorimetric Sensor for Precise Detection of Hydrogen Peroxide Vapor
Study at a glance
- Design
- Other — Ammonium titanyl oxalate paper sensor calibrated against H2O2 vapor
- N
- Analytical sensing method — no sample cohort N
- Population
- Paper-based colorimetric sensors exposed to H2O2 vapor
- Outcome
- Colorimetric LOD and selectivity for hydrogen peroxide vapor (~0.04 ppb)
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Authors drop-cast ammonium titanyl oxalate on paper towels, characterised Ti–peroxo formation by UV–vis, FTIR and XPS, and calibrated color/absorbance versus H2O2 vapor generated from diluted 30 wt% solutions.
What they found
Colorless-to-yellow change peaking near 400 nm; LOD ≈ 0.04 ppb from 0.0025 AU noise and 0.187 AU ppb−1 sensitivity; first-order vapor-diffusion kinetics; high selectivity versus water, O2 and common solvents.
The limits
What it doesn't show
Field deployment against real IED plumes or long-term humidity cycling is not demonstrated—calibration used sealed-container vapors above aqueous H2O2.
Key terms
- Titanyl oxalate
- Ammonium titanyl oxalate, a Ti(IV) precursor that binds peroxide.
- Ti(IV)–peroxide complex
- Coordination complex that absorbs near 400 nm and appears bright yellow.
- LOD
- Limit of detection, here ~0.04 ppb H2O2 vapor.
- Colorimetric sensor
- Device that reports analyte concentration by a visible color change.
- Cellulose microfibrils
- Porous paper fibers providing high surface area for the titanyl salt.
Flashcards
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Quiz yourself
The yellow color comes from:
Common questions
What color change is observed?
Colorless to bright yellow, λmax ≈ 400 nm.
What LOD is reported?
0.04 ppb.
How is the paper prepared?
Drop-cast 100 μL titanyl solution on 2.5×2.5 cm paper, vacuum dry 1 h.
What XPS O 1s feature indicates peroxide?
A secondary peak near 535 eV assigned to O–O.
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