SRIM Simulation of Carbon Ions Interaction with Ni Nanotubes

By template synthesis method nickel nanotubes with diameter of 400 nm and length of 12 μm were produced in the pores of PET template. The nanotubes were modified by irradiation with carbon ions with energy of 28 MeV and a dose of 5 × 1011 cm-2. To ensure the maximum efficiency of nanostructures modification process, energy of irradiation was decided by using of SRIM software. Based on SRIM simulation of carbon ions interaction with Ni nanotubes, the areas on which effect of high energy ions will maximum were predicted. A comparative analysis of nanostructures before and after irradiation was carried out by scanning electron microscopy. The maximum change in nanotubes morphology, in the form of destruction of walls, was appeared at a distance of about 10 μm from the start point of C3+ ions track inside the nanotubes. A substantiation of reason of wall degradation in this area was proposed. © 2019 Elsevier Ltd.Horizon 2020 Framework Programme, H2020: 778308

Morphology and microstructure evolution of gold nanostructures in the limited volume porous matrices

The modern development of nanotechnology requires the discovery of simple approaches that ensure the controlled formation of functional nanostructures with a predetermined morphology. One of the simplest approaches is the self-assembly of nanostructures. The widespread implementation of self-assembly is limited by the complexity of controlled processes in a large volume where, due to the temperature, ion concentration, and other thermodynamics factors, local changes in diffusion-limited processes may occur, leading to unexpected nanostructure growth. The easiest ways to control the diffusion-limited processes are spatial limitation and localized growth of nanostructures in a porous matrix. In this paper, we propose to apply the method of controlled self-assembly of gold nanostructures in a limited pore volume of a silicon oxide matrix with submicron pore sizes. A detailed study of achieved gold nanostructures’ morphology, microstructure, and surface composition at different formation stages is carried out to understand the peculiarities of realized nanostructures. Based on the obtained results, a mechanism for the growth of gold nanostructures in a limited volume, which can be used for the controlled formation of nanostructures with a predetermined geometry and composition, has been proposed. The results observed in the present study can be useful for the design of plasmonic-active surfaces for surface-enhanced Raman spectroscopy-based detection of ultra-low concentration of different chemical or biological analytes, where the size of the localized gold nanostructures is comparable with the spot area of the focused laser beam. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.3.1.5.1Ministry of Education and Science of the Russian Federation, Minobrnauka: К-2018-036, N 211Russian Foundation for Fundamental Investigations, RFFI: 19-32-50058European Commission, ECMinistry of Science and Technology, MOSTFunding: This research was funded by H2020-MSCA-RISE2017-778308-SPINMULTIFILM Project, the scientific– technical program, ‘Technology-SG’ [project number 3.1.5.1], Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST «MISiS» [№ К-2018-036], implemented by a governmental decree dated 16th of March 2013, N 211 and Russian Foundation for Fundamental Investigations [project number 19-32-50058].Acknowledgments: D.V.Y. greatly acknowledges the World Federation of Scientists National Scholarship Program. E.Yu.K., D.V.Y., V.D.B., and V.S. greatly acknowledge the European Union program Mobility Scheme for Targeted People-to-People-Contacts (MOST) for supporting research visits

Плазмонно-активные серебряные наноструктуры в порах ионно-трекового шаблона SiO2 на кремнии

Today, the possibility of amplifying the signal of Raman scattering is intensively studied in order to realize a simple and reliable tool for monitoring of ultra-small concentrations of chemical and biological substances. Plasmon-active nanostructures can serve as the basic element of substrates for signal amplifying, and the degree of amplification is determined by nanostructures size and shape. The formation of nanostructures with a predetermined morphology requires the development of new approaches. In this concern, the paper considers a complex approach of plasmon-active silver nanostructures with a wide range of shapes and sizes formation in the pores of ion-track Sio2 templates on silicon. The peculiarities of SiO2 templates creation are considered and the etching rates, uniquely determining the parameters of the pores as a function of the etching time, are established. The features of the silver nanostructures formation in the pores of the SiO2 template are described for various pore sizes and synthesis regimes (time and solution temperature). The possibility of formation of nanostructures with different shapes as well as evolution of their morphology with variation of synthesis parameters is shown. on the example of dendrites, having a high potential for practical application for amplification of the Raman scattering signal, the possibility of recording Raman spectra was demonstrated using the model analyzer Nile Blue at the concentration of 10-6 M/l. The results indicate that plasmon-active silver nanostructures in the pores of ion-track Si02 template on silicon can be used as basic element of biosensors to studying ultra-low doses of chemical and biological substances.Communicated by Corresponding Member Valery M. FedosyukНа сегодняшний день интенсивно исследуется возможность усиления сигнала комбинационного рассеяния света с целью реализации простого и надежного инструмента для контроля сверхмалых концентраций химических и биологических веществ. В качестве основы усиливающих сигнал подложек могут выступать плаз-монно-активные наноструктуры, степень усиления которых определяется их размером и формой. Формирование наноструктур с заранее заданной морфологией требует разработки новых методик. В связи с этим в работе рассматривается комплексный подход к получению в порах ионно-трековых шаблонов SiO2 на кремнии плазмонно-активных серебряных наноструктур, имеющих широкий спектр форм и размеров. Рассмотрены особенности создания SiO2-шаблонов и установлены скорости травления, однозначно определяющие параметры пор в зависимости от времени процесса. Описаны особенности формирования серебряных наноструктур в порах Si02-шаблона при различных размерах пор и режимах синтеза (время и температура раствора). Показана возможность создания наноструктур с различной формой и продемонстрированы закономерности эволюции их морфологии при изменении параметров синтеза. С использованием дендритов, имеющих высокий потенциал для практического применения для усилении сигнала комбинационного рассеяния света, на примере модельного аналита Nile Blue с концентрацией 10-6 моль/л продемонстрирована возможность регистрации спектров комбинационного рассеяния света. Полученные результаты свидетельствуют, что плазмонно-активные серебряные наноструктуры в порах ионно-трекового шаблона SiO2 на кремнии могут найти применение при создании биосенсоров для регистрации сверхнизких доз химических и биологических веществ.Представлено членом-корреспондентом В.М. Федосюко

A Simple Way to Control the Filling Degree of the SiO2/Si Template Pores With Nickel

The paper demonstrates a simple way to control the filling degree of the pores of a silicon oxide template on silicon substrate with nickel. SiO2/Si template was formed using the swift heavy ion tracks technology, which includes irradiation with high energy ions and chemical transformation of the obtained latent tracks into the pores. The preparation of SiO2(Ni)/Si nanostructures with different filling degree of pores in SiO2 with nickel was performed using the electrodeposition method by changing the duration of the process. A study and analysis of the morphology of SiO2(Ni)/Si nanostructures using scanning electron and atomic force microscopy was carried out to determine the nature of pore filling by metal. © 2019 Elsevier Ltd.The authors acknowledge the support of the work in frames of H2020 - MSCA - RISE2017 - 778308 - SPINMULTIFILM Project and the Scientific-technical program ‘Technology-SG’ [project number 3.1.5.1]

Degradation mechanism and way of surface protection of nickel nanostructures

Stability of nanomaterials during their life cycle is a crucial problem of modern nanoscience. In order to understand the processes, which are going in the nanostructures, the comprehensive study of the influence of media with different acidity on the nickel nanotubes morphology and structure was carried out. On the base of the analysis of nanotubes characteristics, sequential evolution of degradation stages involving the surface passivation, formation of point defects, pitting and destruction of nanotubes walls was determined. The results are of importance for the wide range of potential nickel nanostructures applications, which are associated with their using in real-life conditions. To improve Ni nanostructures stability, the possible ways of surface protections from the aggressive environment effect and the routes of nanostructures covering with gold, organosilicon compounds and polymer coatings were considered. Demonstrated approaches for nanostructures covering provide an opportunity of surface functionalization for attaching of different molecules. It is useful for targeted delivery of drugs and genes, biodetection, bioseparation and catalysis application. © 2018 Elsevier B.V