Preparation, Characterization, and Mechanistic Understanding of Pd-Decorated ZnO Nanowires for Ethanol Sensing

Table 2

The Comparison with the fabrication parameters of Pd-ZnO-NWs sensors reported in the literature and our work.

Structure	Diameter/length (nm/𝜇m)	Concentration (ppm)	Operating temperature (°C)	Response^a (%)	Response/recovery time (s)
Pd-ZnO-NWs-5 (our work)	70–100/5	200	325	76.4	9/9
Pd-decorated ZnO nanorods [22]	70/0.5	1530	200	94	14/70
Pd-sensitized ZnO-NWs [20]	50/3.5	500	230	61.5	a few seconds/more than 100 seconds
Pd-functionalized individual ZnO microwire [23]	1000/50–200	200	400	13	−/−
Pd/ZnO spheroidal and rod-like nanoparticles [24]	10–20; width: 10–20; length: 20–50	250	400	65.7	15/within minutes
Pd incorporated ZnO nanoparticles [20]	17	200	170	68	60/10

aApplies (𝑅_𝑎−𝑅_𝑔)/𝑅_𝑎 for the response.