The dataset provides morphological, crystallographic, and surface chemistry data. Morphology is assessed via Transmission Electron Microscopy (TEM), with particle size distribution measured at multiple magnifications (50kX, 100kX, 400kX), including average sizes and SDs. Specific surface area and band gaps are also reported. Crystallographic properties are characterized using X-ray Diffraction (XRD) capturing crystallinity percentage, amorphous phase content, average crystallite size, and specific crystal structures. Surface chemistry is analyzed via X-ray Photoelectron Spectroscopy (XPS), providing elemental composition, binding energies for electron transitions, and % atomic concentration.

The dataset captures the surface chemical characterization of NEPs. XPS is used to analyze surface composition, detecting elemental presence and chemical states. The element name, binding energy, R.S.F, FWHM of XPS peaks are recorded providing insights into chemical uniformity and % atomic concentration of the distribution of elements on the sample surface.

The dataset focuses on hydrodynamics and surface charge properties. It includes the initial stock concentration (weight-based) and the diluted working concentration. Hydrodynamic diameter and PDI are measured using DLS in suspension, with SDs reported. Surface charge properties are assessed through ζ-potential measurements in water, recorded alongside SDs and pH values, using ELS. The isoelectric point is reported, indicating the pH at which NMs exhibit zero net surface charge. This dataset is complete, with no missing values.

Functionality dataset provides photocatalytic activity tests for NEPs, assessing the degradation of Nitrogen Oxide (NO) and nitrogen dioxide (NO₂) gases under visible light, measured via chemiluminescence. Key parameters recorded include irradiance (W/m²), temperature, and sample dimensions. NO degradation is quantified through initial NO concentration (ppbv) and exposure duration (min). TiO₂ deposition on PMMA substrates is quantified using ICP-OES, with measurements including TiO₂ mass (mg/m²), analysed area, PMMA weight (g/m²), sample weight and TiO₂ content per PMMA sample (mg). For textiles the TiO₂ concentration is expressed as mg Ti/g textile and wt%. This metadata includes measurements from 2 different partners, leading to apparent missing values due to differences in reporting metrics rather than actual data gaps