rus
Issue #4/2017
I.Yaminsky, A.Akhmetova, M.Smirnova
Scanning probe microscopy of local chemical reactions in deposited thin films
Scanning probe microscopy of local chemical reactions in deposited thin films
Implementation of the scanning capillary microscopy mode in the scanning probe microscopes opens new features in the control of local chemical reactions.
Теги: scanning capillary microscopy scanning probe microscopy сканирующая зондовая микроскопия сканирующая капиллярная микроскопия
Controlled surface modification in natural conditions – in air and in liquid environments – including conducting of the chemical reactions involving a minimum number of atoms and molecules is of great interest for many practical applications. The change of the surface properties and implementation of chemical reactions in the nanometer scale area opens up new ways of creation of chemical and biological sensors with ultimate sensitivity at the level of single atoms and molecules..
Exactly the determination of the basic regularities of local surface modification in the natural environment is a key task of the joint project of scientists of Lomonosov Moscow State University and Sharif University of Technology (Tehran, Iran) [1]. Iranian colleagues led by Farshad Salehi, the supervisor of the project, have extensive experience in basic research of thin films, have a rich experimental technological base for creation of conductive and dielectric films with the required parameters. Thanks to a joint implementation of the project, a new methods of surface modification in natural environments with changing parameters – temperature, composition, flow rate, etc. – were developed.
FemtoScan scanning probe microscope that is widely used in scientific research and technological works by both Russian and Iranian sides, comes with the unique feature to manage all measurement modes in multiuser mode via the Internet. Due to this, experiments on scanning probe microscopy are held together remotely, and both Russian and Iranian scientists get all the data in real-time. This is especially important for long and complex experiments, which include tests in the field of surface modification of materials and experimental works on determination of the impact of environmental parameters on the nature of the flow of local surface reactions.
At the moment, our group carries out the integration of the scanning capillary microscopy mode into FemtoScan and FemtoScan X scanning probe microscopes [2]. Using a scanning tunneling microscope we investigate the possibility of removing individual atoms and local areas from the graphite substrate in air at a controlled humidity in the range of 10–95%. We are also faced with the task of testing technologies for the creation of multi-channel capillaries with the diameter of outlet holes from 5 to 100 nm.
Other objectives of the project:
• creation of a lithographic pattern using a scanning probe microscope with a characteristic size of about 50 nm on the surface of carbon materials, metal films (aluminum, titanium) and semiconductors (doped silicon);
• development of methods of lithography with atomic resolution in air and under controlled gas environment;
• evaluation of local energy impact of electric pulse on the surface of the materials.
In the perspective the challenges of delivery of chemical reagents and buffers into the area of nanometer-scale using a multichannel capillary systems are considered. For these tasks we use a scanning ion-conductance microscope, in which the capillary probe can be used for delivery of substances, as an electrochemical sensor, pH meter, test system for the detection of metal ions, etc. This solution allows to implement new approaches in nanolithography in the natural environment – in the air and water. Multi-channel capillary probe gives the ability to create in the local area the conditions for the defined local chemical reactions. The capabilities of scanning ion-conductance microscopy are much broader than just the observation of the surface topography of rough objects with a low mechanical rigidity. The use of a multichannel capillaries as a probe is promising for multiparameter analysis of cells [3, 4].
Currently, multi-channel capillaries are used in the Nanotechnologies youth innovation creativity centre in the study of blood cells in the field of biomedicine of the Healthnet platform of National technology initiative (Fig.1–3). Using a multichannel capillaries the possibility to determine the antibiotic resistance of bacteria E. coli is studied. With the use of scanning ion-conductance microscope we work on visualization of red blood cells, in particular, on the delicate attachment of erythrocytes to the cover glass using polylysine. ■
The study was performed with financial support of RFBR in the framework of research project 17-52-560001. The authors express their sincere gratitude to the Government of Moscow, Department of science, industrial policy and entrepreneurship of Moscow, the Ministry of economic development (contract No. 8/3-63ин-16 from 22.08.16) for financial support of projects of the Nanotechnologies YICC.
Exactly the determination of the basic regularities of local surface modification in the natural environment is a key task of the joint project of scientists of Lomonosov Moscow State University and Sharif University of Technology (Tehran, Iran) [1]. Iranian colleagues led by Farshad Salehi, the supervisor of the project, have extensive experience in basic research of thin films, have a rich experimental technological base for creation of conductive and dielectric films with the required parameters. Thanks to a joint implementation of the project, a new methods of surface modification in natural environments with changing parameters – temperature, composition, flow rate, etc. – were developed.
FemtoScan scanning probe microscope that is widely used in scientific research and technological works by both Russian and Iranian sides, comes with the unique feature to manage all measurement modes in multiuser mode via the Internet. Due to this, experiments on scanning probe microscopy are held together remotely, and both Russian and Iranian scientists get all the data in real-time. This is especially important for long and complex experiments, which include tests in the field of surface modification of materials and experimental works on determination of the impact of environmental parameters on the nature of the flow of local surface reactions.
At the moment, our group carries out the integration of the scanning capillary microscopy mode into FemtoScan and FemtoScan X scanning probe microscopes [2]. Using a scanning tunneling microscope we investigate the possibility of removing individual atoms and local areas from the graphite substrate in air at a controlled humidity in the range of 10–95%. We are also faced with the task of testing technologies for the creation of multi-channel capillaries with the diameter of outlet holes from 5 to 100 nm.
Other objectives of the project:
• creation of a lithographic pattern using a scanning probe microscope with a characteristic size of about 50 nm on the surface of carbon materials, metal films (aluminum, titanium) and semiconductors (doped silicon);
• development of methods of lithography with atomic resolution in air and under controlled gas environment;
• evaluation of local energy impact of electric pulse on the surface of the materials.
In the perspective the challenges of delivery of chemical reagents and buffers into the area of nanometer-scale using a multichannel capillary systems are considered. For these tasks we use a scanning ion-conductance microscope, in which the capillary probe can be used for delivery of substances, as an electrochemical sensor, pH meter, test system for the detection of metal ions, etc. This solution allows to implement new approaches in nanolithography in the natural environment – in the air and water. Multi-channel capillary probe gives the ability to create in the local area the conditions for the defined local chemical reactions. The capabilities of scanning ion-conductance microscopy are much broader than just the observation of the surface topography of rough objects with a low mechanical rigidity. The use of a multichannel capillaries as a probe is promising for multiparameter analysis of cells [3, 4].
Currently, multi-channel capillaries are used in the Nanotechnologies youth innovation creativity centre in the study of blood cells in the field of biomedicine of the Healthnet platform of National technology initiative (Fig.1–3). Using a multichannel capillaries the possibility to determine the antibiotic resistance of bacteria E. coli is studied. With the use of scanning ion-conductance microscope we work on visualization of red blood cells, in particular, on the delicate attachment of erythrocytes to the cover glass using polylysine. ■
The study was performed with financial support of RFBR in the framework of research project 17-52-560001. The authors express their sincere gratitude to the Government of Moscow, Department of science, industrial policy and entrepreneurship of Moscow, the Ministry of economic development (contract No. 8/3-63ин-16 from 22.08.16) for financial support of projects of the Nanotechnologies YICC.
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