Physico-Chemical nanomaterials science

Design of Carbon-Silicon hybrid nanostructures
Lisnyak V. V. 1,2, Mussabek G. K.2, Zhylkybayeva N. Zh.2, Baktygerey S. Z.2, Orishko A. Yu..1, Zaderko A. N.1
1 Taras Shevchenko National University of Kyiv, Volodymyrska Street, 64/13, Kyiv 01601, Ukraine. E-mail: lisnyak@univ.kiev.ua
2 Institute of Information and Computational Technologies, 125, Pushkin Str., 050000 Almaty, Kazakhstan
3 Al-Farabi Kazakh National University, 71, Al-Farabi Ave., 050040 Almaty, Kazakhstan
Silicon nanoparticles (Si NPs) are the objects of increased scientific interest to be used as new photonic and electronic probes. In this communication, we focused on preparing Si@C hybrids; they are based on structured Si NPs of 7–20 nm. These Si@C hybrids were prepared by the chemical-thermal methods using commercial Si NPs. Typically, the Si@C hybrids are crystalline pseudo-spherical Si NPs decorated with carbon NPs, mainly unstructured, two-dimensional, and amorphous. The desired result, the decorated Si NPs with small carbon NPs, attracts attention. So, the developed approaches are of direct interest for further optimization and approbation in the functionalization of Si nanowires as-probes. The nanohybrids when carbon NPs formed at the interface and edge dislocations of nanosilicon are unique. The chemical-thermal methods have great potential for creating sensor-type devices. In them, the determination of a wide range of gaseous analytes will be done when nanocarbons bonded with silicon in hybrid nanostructures are used as a probe. Our data reveal that the prepared hybrids as sensor materials have high selectivity towards ammonia in the alcohol/ammonia binary mixed gases. We found an increase in the baseline resistances of sensors with RH, but, as found, the 45% RH humidity degrades the sensing response. The hybrids show a linear response in the range of 1 to 20 ppm of ammonia gas, with the electric response signal that ranged from 5 to 100 r.u., and sensors showed excellent selectivity. 

ACKNOWLEDGEMENTS
G.K. Mussabek, S.Z. Baktygerey, and V.V. Lisnyak acknowledge the support of Grant No AP08856579 of the Ministry of Education and Science of the Republic of Kazakhstan.