TY - JOUR
T1 - Incident fluence dependent morphologies, photoluminescence and optical oxygen sensing properties of ZnO nanorods grown by pulsed laser deposition
AU - Liu, Xiao
AU - Sun, Ye
AU - Yu, Miao
AU - Yin, Yongqi
AU - Yang, Bin
AU - Cao, Wenwu
AU - Ashfold, Michael N.R.
N1 - Publisher Copyright:
© The Royal Society of Chemistry.2015.
PY - 2015/3
Y1 - 2015/3
N2 - ZnO nanorod (NR) samples have been prepared by 248 nm pulsed laser deposition using three different fluences, F, at the target surface. F is shown to influence the sample morphology and its photoluminescence (PL) properties. Use of large F (∼4.0 J cm-2) results in ZnO NRs with relatively low surface area to volume (S/V) ratio, the PL spectra of which are characterized by a weak near-UV component (IUV) and a relatively intense visible (Ivis) emission feature attributable to the presence of zinc rich and oxygen deficient defects. Use of small F (∼1.2 J cm-2) yields ZnO NRs with larger S/V ratio, and a much increased IUV/Ivis emission ratio. The O2 sensing properties of these NR samples have been investigated by monitoring IUV as a function of O2 partial pressure, over a range of working temperatures (room temperature to 240°C). All of the NR samples are shown to function as optical O2 sensors, the responses of which are enhanced by operating at elevated temperatures, but the detailed sensitivity (and its temperature dependence) are shown to be strongly dependent on their (F-determined) S/V ratio and defect density.
AB - ZnO nanorod (NR) samples have been prepared by 248 nm pulsed laser deposition using three different fluences, F, at the target surface. F is shown to influence the sample morphology and its photoluminescence (PL) properties. Use of large F (∼4.0 J cm-2) results in ZnO NRs with relatively low surface area to volume (S/V) ratio, the PL spectra of which are characterized by a weak near-UV component (IUV) and a relatively intense visible (Ivis) emission feature attributable to the presence of zinc rich and oxygen deficient defects. Use of small F (∼1.2 J cm-2) yields ZnO NRs with larger S/V ratio, and a much increased IUV/Ivis emission ratio. The O2 sensing properties of these NR samples have been investigated by monitoring IUV as a function of O2 partial pressure, over a range of working temperatures (room temperature to 240°C). All of the NR samples are shown to function as optical O2 sensors, the responses of which are enhanced by operating at elevated temperatures, but the detailed sensitivity (and its temperature dependence) are shown to be strongly dependent on their (F-determined) S/V ratio and defect density.
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U2 - 10.1039/c4tc02924k
DO - 10.1039/c4tc02924k
M3 - Article
AN - SCOPUS:84924311226
SN - 2050-7534
VL - 3
SP - 2557
EP - 2562
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 11
ER -