CuO/ZnO Nanocorals synthesis via hydrothermal technique: growth mechanism and their application as Humidity Sensor
2012 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 22, no 23, 11583-11590 p.Article in journal (Refereed) Published
We demonstrate hydrothermal synthesis of coral-like CuO nanostructures by selective growth on ZnO nanorods (NR) at low temperatures. During the hydrothermal processing the resultant hydroxylated and eroded surface of ZnO NR becomes favorable for the CuO nanostructures growth via oriented attachments. Heterojunction p-n diodes fabricated from the CuO/ZnO nanocorals (NC) reveal stable and high rectification diode properties with a turn-on voltage ~1.52 V and negligible reverse current. The humidity sensing characteristics of the CuO/ZnO NC diodes exhibit a remarkable linear (in a semilogarithmic scale) decrease in the DC resistance by more than three orders when the relative humidity is changed from 30 – 90 %. The NC humidity sensor is also found to reveal the highest sensitivity factor ~6045 among available data for the constituent material’s and a response and recovery time of 6 s and 7 s, respectively.
Place, publisher, year, edition, pages
Royal Society of Chemistry, 2012. Vol. 22, no 23, 11583-11590 p.
Zinc oxide nanorods, copper oxide nanostructures, nanocorals, relative humidity, sensitivity factor
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-76676DOI: 10.1039/c2jm16597jISI: 000304351400026OAI: oai:DiVA.org:liu-76676DiVA: diva2:515783
funding agencies|Swedish government||2012-04-162012-04-162014-01-15Bibliographically approved