Microscopy Morphology

Field-emission SEM

Cu-CAT nanowire arrays on carbon fibre paper · Electrode

Blank carbon fibre paper compared with Cu-CAT NWAs grown on fibres; FE-SEM operated at 1.5 or 5.0 kV.

Geometry: nanowires on carbon fibres
Context: Pristine Cu-CAT on carbon fibre paper
Measurement source: p.2, p.6 · Morphology and Structural Analysis; Characterization · Figure 1b-d

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
blank carbon fibre diameter	approximately 2 um	—	—	Text Approximate	p.2 · Morphology and Structural Analysis · Figure 1b
Cu-CAT NWA diameter upper bound	200-250 nm	—	—	Text Range	p.2 · Morphology and Structural Analysis · Figure 1c,d
Cu-CAT NWA diameter lower bound	200-250 nm	—	—	Text Range	p.2 · Morphology and Structural Analysis · Figure 1c,d
Cu-CAT NWA length upper bound	3-15 um	—	—	Text Range	p.2 · Morphology and Structural Analysis · Figure S2
Cu-CAT NWA length lower bound	3-15 um	—	—	Text Range	p.2 · Morphology and Structural Analysis · Figure S2

Cu-CAT nanowire arrays on carbon fibre paper · Electrode

TEM at 200 kV; lattice fringes and SAED used to assign single-crystal character and [001] growth direction.

Geometry: individual Cu-CAT nanowire
Context: Cu-CAT nanowire from NWA sample
Measurement source: p.2-3 · Morphology and Structural Analysis · Figure 2a,b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
nanowire growth direction	along [001]	—	—	Text Qualitative	p.2-3 · Morphology and Structural Analysis · Figure 2b; Figure S3
TEM lattice fringe spacing	1.83 nm	—	—	Text Exact Reported	p.2 · Morphology and Structural Analysis · Figure 2b