Engineering and Architecture
Technologies for Nanosystems, Bioengineering and Energy
2D nanomaterials for gas sensing and energy
Chalcogenide nanomaterials show very interesting optical and electronic properties for energy-related applications, catalysis or gas sensing and, therefore, have been attracting increasing interest in the last few years. Beyond zero-bandgap graphene, 2-dimensional (2D) chalcogenides are being intensively researched nowadays. It has been emphasized both experimentally and theoretically that semi conductive dichalcogenides are potential candidate materials for the development of gas sensors with superior performance. With the increasing demand of highly sensitive, fast, and stable sensors, a series of sensing applications of nanoscale 2D chalcogenide-based composites and hybrids have been of growing interest. It has been reported that structural defects, including point defects, grain boundaries and edges play significant roles in sensing applications. However, large-scale fabrication of sensors employing these 2D nanomaterials, the tuning of selectivity, and improvement of signal to noise ratio are still a challenge. Therefore, there is significant scope remaining for fully exploring new materials with advanced properties. Out of various methods for the growth of 2D chalcogenide-based hybrid nanomaterials, chemical vapor deposition (CVD) is a promising approach to achieve high-quality nanosheets with good control on shape, size and number of horizontally or vertically stacked layers. In this context, this thesis aims, on the one hand, at exploring chemical vapor deposition techniques for the synthesis of mono and dichalcogenides. Special emphasis will be put towards the scalable synthesis of 2D nanomaterials, either directly or transferring them afterwards, onto different application substrates. On the other hand, the thesis will envisage the development of functional gas sensing devices (resistive or field effect transistor configurations) employing the materials developed. Decoration with metal or metal oxide nanoparticles or grafting of functional groups will be explored as a way to tune the interfacial properties of the resulting hybrid nanomaterial in view of fine tuning selectivity. Collaborations with theoreticians able to build computational models explaining the interaction between the nanomaterials and gas molecules, and with experimentalists employing surface-sensitive spectroscopies will be exploited not only to gain deep insight into detection mechanisms, but also to find a rationale for the design and optimization of nanomaterials.
37.5 hours a week
|This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 713679|