Erratum to: J Sol–Gel Sci Technol (2017) 81:769–773 DOI 10.1007/s10971-016-4251-5The original version of this article unfortunately contained a mistake in the author group. The co-author Dr. Somenath Roy should not have been included in the author group. The name and affiliation of the co-author is removed with this erratum.

In addition, the author has provided an updated acknowledgements section which should read as:

Acknowledgements The author acknowledges the contributions from Dr. S. Roy, Senior Scientist, Sensor & Actuator Division, CSIR-CGCRI, the Material Characterization Division and the scientific staffs of CSIR-CGCRI for their help. The author has also utilized the facilities of the DST-CSIR Sensor Hub, Kolkata.