Journal article

Quasi physisorptive two dimensional tungsten oxide nanosheets with extraordinary sensitivity and selectivity to NO2

Hareem Khan, Ali Zavabeti, Yichao Wang, Christopher J Harrison, Benjamin J Carey, Md Mohiuddin, Adam F Chrimes, Isabela Alves De Castro, Bao Yue Zhang, Ylias M Sabri, Suresh K Bhargava, Jian Zhen Ou, Torben Daeneke, Salvy P Russo, Yongxiang Li, Kourosh Kalantar-Zadeh



Attributing to their distinct thickness and surface dependent physicochemical properties, two dimensional (2D) nanostructures have become an area of increasing interest for interfacial interactions. Effectively, properties such as high surface-to-volume ratio, modulated surface activities and increased control of oxygen vacancies make these types of materials particularly suitable for gas-sensing applications. This work reports a facile wet-chemical synthesis of 2D tungsten oxide nanosheets by sonication of tungsten particles in an acidic environment and thermal annealing thereafter. The resultant product of large nanosheets with intrinsic substoichiometric properties is shown to be highly s..

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University of Melbourne Researchers


Awarded by ARC Centre of Excellence in Exciton Science

Awarded by ARC Centre of Excellence FLEET

Funding Acknowledgements

The authors would like to acknowledge the facilities as well as scientific and technical assistance of the Australian Microscopy & Microanalysis Research Facility (RMMF), the Micro Nano Research Facility (MNRF) and the Suresh Bhargava Mercury Lab at RMIT University. S. P. R. acknowledges the support of the ARC Centre of Excellence in Exciton Science (CE170100026) and ARC Centre of Excellence FLEET (CE170100039). This work was supported by computational resources provided by the Australian Government through the National Computational Infrastructure National Facility and the Pawsey Supercomputer Centre. We also acknowledge the CSIRO (Dr Anthony Chesman) for facilitation of the PESA measurements. H. K., T. D., J. Z. O., and K. K.- Z. conceptualised the work. T. D. and K. K.- Z. designed the synthesis methodology. H. K. and A. C. performed the gas-sensing measurements. H. K. performed the TGA measurements. A. Z. and Y. W. performed the XPS measurements. J. Z. O. and Y. W. performed the Raman spectroscopy. H. K. performed the XRD. H. K., C. J. H and Y. M. S. performed the humidity measurements. H. K. performed the AFM. I. A. dC. carried out the BET measurements and B. Y. Z. and H. K. carried out the Mott-Schottky measurements. B. J. C. performed the HRTEM. S. P. R. performed the DFT theoretical calculations. H. K. and A. Z. performed the TEM. H. K. and A. Z. performed SEM. Y. L. was consulted on the characterisation and measurements techniques. H. K., M. M., T. D., J. Z. O. and K. K.- Z analysed the data and prepared the manuscript. All the authors contributed to the text and revision of the manuscript.