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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.
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What visual and spectroscopic change reports H2O2?
Colorless to bright yellow Ti(IV)–peroxide, absorption maximum ~400 nm.
Source: Designing Tunable Paper-Based Colorimetric Sensor for Precise Detection of Hydrogen Peroxide Vapor · DOI · quote verified
What LOD is reported for H2O2 vapor?
0.04 ppb (calculated 0.0401 ppb).
Source: Designing Tunable Paper-Based Colorimetric Sensor for Precise Detection of Hydrogen Peroxide Vapor · DOI · quote verified
How were noise and sensitivity measured?
σ = 0.0025 AU (10 replicates); S = 0.187 AU per ppb.
Source: Designing Tunable Paper-Based Colorimetric Sensor for Precise Detection of Hydrogen Peroxide Vapor · DOI · quote verified
How is the paper sensor fabricated?
Drop-cast 100 μL aqueous ammonium titanyl oxalate on 2.5 × 2.5 cm paper, vacuum dry 1 h.
Source: Designing Tunable Paper-Based Colorimetric Sensor for Precise Detection of Hydrogen Peroxide Vapor · DOI · quote verified
What FTIR region flags the peroxo complex?
850–950 cm−1 after H2O2 exposure.
Source: Designing Tunable Paper-Based Colorimetric Sensor for Precise Detection of Hydrogen Peroxide Vapor · DOI · quote verified
What XPS O 1s features were assigned?
530 eV lattice titanyl oxygen and ~535 eV peroxide O–O.
Source: Designing Tunable Paper-Based Colorimetric Sensor for Precise Detection of Hydrogen Peroxide Vapor · DOI · quote verified
What kinetic order describes the vapor response?
First-order in H2O2 vapor diffusion, with 0.04 ppb sensing equivalency.
Source: Designing Tunable Paper-Based Colorimetric Sensor for Precise Detection of Hydrogen Peroxide Vapor · DOI · quote verified
How selective is the sensor versus common interferents?
No significant interference from water, oxygen, or organic solvents.
Source: Designing Tunable Paper-Based Colorimetric Sensor for Precise Detection of Hydrogen Peroxide Vapor · DOI · quote verified
What saturated vapor concentration was used in one test geometry?
230.4 ppm above 30 wt% H2O2.
Source: Designing Tunable Paper-Based Colorimetric Sensor for Precise Detection of Hydrogen Peroxide Vapor · DOI · quote verified
Why cellulose/paper towels?
Cheap, porous microfibrils with high surface area that can be functionalized.
Source: Designing Tunable Paper-Based Colorimetric Sensor for Precise Detection of Hydrogen Peroxide Vapor · DOI · quote verified
What titanyl loadings were drop-cast from stock solutions?
0.001 to 1.0 mol/L ammonium titanyl oxalate.
Source: Designing Tunable Paper-Based Colorimetric Sensor for Precise Detection of Hydrogen Peroxide Vapor · DOI · quote verified