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
Research intelligence for this paper
See its role on concept claims, tensions it is part of, placement history, and related discoveries.
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.
More on Spectroscopy