Introduction to nanotechnology
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Тематика:
Общетехнические дисциплины
Год издания: 2023
Кол-во страниц: 112
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Вид издания:
Учебное пособие
Уровень образования:
ВО - Специалитет
ISBN: 978-5-8064-3338-2
Артикул: 850004.01.99
Учебное пособие является авторским переводом курса лекций по основам нанотехнологий, читаемого в институте физики РГПУ им. А. И. Герцена (направление «Физика», профиль «Физика конденсированного состояния
вещества» и направление «Педагогическое образование», профиль «Физическое образование»). В нем на доступном уровне рассматриваются особенности мира нанообъектов, возможности современной диагностической аппаратуры нанотехнологий, принципы микро- и наноэлектроники. Пособие ставит целью помочь в понимании важных вопросов современной физики как российским студентам, изучающим английский язык, так
и иностранным студентам, владеющим английскимй языком на более высоком уровне, чем русским. Оно может быть полезно широкому кругу студентов и преподавателей, знакомящихся с принципами нанонауки.
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The Herzen State Pedagogical University of Russia Российский государственный педагогический университет им. А. И. Герцена Khinich I. I., Kononov A. A., Kolobov A. V. Хинич И. И., Кононов А. А., Колобов А. В. INTRODUCTION TO NANOTECHNOLOGY ВВЕДЕНИЕ В НАНОТЕХНОЛОГИИ Tutorial Учебное пособие St. Petersburg Herzen University Publishing 2023
Печатается по решению редакционно-издательского совета РГПУ им. А. И. Герцена УДК 53.08 ББК 22.353 Х47 Рецензенты: М. А. Зеликман, доктор физико-математических наук, профессор, Санкт-Петербургский политехнический университет Петра Великого П. И. Лазаренко, кандидат технических наук, доцент, Национальный исследовательский университет «МИЭТ» Х47 Хинич И. И. Введение в нанотехнологии : учебное пособие / И. И. Хинич, А. А. Кононов, А. В. Колобов. — Санкт-Петербург : Издво РГПУ им. А. И. Герцена, 2023. — 112 с. ISBN 978-5-8064-3338-2 Учебное пособие является авторским переводом курса лекций по основам нанотехнологий, читаемого в институте физики РГПУ им. А. И. Герцена (направление «Физика», профиль «Физика конденсированного состояния вещества» и направление «Педагогическое образование», профиль «Физическое образование»). В нем на доступном уровне рассматриваются особенности мира нанообъектов, возможности современной диагностической аппаратуры нанотехнологий, принципы микро- и наноэлектроники. Пособие ставит целью помочь в понимании важных вопросов современной физики как российским студентам, изучающим английский язык, так и иностранным студентам, владеющим английскимй языком на более высоком уровне, чем русским. Оно может быть полезно широкому кругу студентов и преподавателей, знакомящихся с принципами нанонауки. УДК 53.08 ББК 22.353 ISBN 978-5-8064-3338-2 И. И. Хинич, А. А. Кононов, А. В. Колобов, 2023 Изд-во РГПУ им. А. И. Герцена, 2023 С. В. Лебединский, дизайн обложки, 2023
УДК 53.08 ББК 22.353 Published by decision of the editorial and publishing council Herzen State Pedagogical University of Russia Reviewers: M. A. Zelikman, Grand PhD in Physics and Mathematics, Professor, St. Petersburg Polytechnic University Peter the Great P. I. Lazarenko, PhD in Engineering sciences, Associate Professor, National Research University of Electronic Technology MIET Khinich I. I. Introduction to nanotechnology : tutorial / I. I. Khinich, A. A. Kononov, A. V. Kolobov. — Saint-Petersburg : Herzen University Publishing, 2023. — 112 p. ISBN 978-5-8064-3338-2 The textbook is the translation of the course of lectures on the basics of nanotechnology, the author has read for students of the training programmes “Physics. Condensed matter Physics” and “Pedagogical education. Physical Education” at the Institute of Physics of the Herzen State Pedagogical University. It examines the features of nano-size objects, the research potential of contemporary diagnostic equipment of nanotechnology, the principles of micro- and nanoelectronics. The book aims to help both Russian and foreign students who speak English at a higher level than Russian in understanding important issues of modern physics. The book can be useful to a wide range of students and teachers who want to get acquainted with the principles of nanoscience. УДК 53.08 ББК 22.353 ISBN 978-5-8064-3338-2 I. I. Khinich, A. A. Kononov, A. V. Kolobov, 2023 Herzen University Publishing, 2023 S. V. Lebedinskii, сover design, 2023
Preface The need to familiarize students of pedagogical universities with the latest advances in nanotechnology by teaching an appropriate course as part of their training program is conditioned by several reasons. Firstly, in the last decades, the development of nanoscience and high technologies have convincingly demonstrated the heuristic possibilities that result from studying specific phenomena and properties of materials at the nanoscale, in which the sizes of objects are commensurate with the sizes of atoms and molecules. One of the most direct effects of reducing the size of materials to the nanometer range is the appearance of size effects, that is a strong dependence of any material characteristics on the size of the structure at the nanoscale, capable of radically changing various properties of materials, self-assembly and self-ordering of atoms and molecules at nanometer distances. Knowledge of these features allows achieving significant results when creating a variety of products. Secondly, at the turn of the 20th and 21st centuries, microelectronics started to use nanoscale building blocks thus becoming a priority field of nanoscience, which embraces the most ambitious and complex challenges. Thirdly, familiarization of students with state-of-art diagnostic equipment of nanotechnology, including scanning probe and electron microscopy, is an important stage in the formation of their professional competencies as they are trained to educate younger generation by disseminating usable knowledge. This textbook is based on the author’s a course of lectures on the basics of nanotechnology, that he has read for students of the Institute of Physics at the Herzen State Pedagogical University over the past few years. The theoretical material of the lectures is accompanied by assignments for laboratory work, when students conduct research into materials using scanning probe and electron microscopes. The book is intended for parallel use in the two languages — Russian and English, which seems productive, as, on the one hand, it can allow Russian students to acquire English-language terminology in the field of physics, as well 4
as improve their reading skills of specialized literature; on the other hand, it will allow foreign students who speak English better than Russian to fully understand the content, and possibly improve their Russian language. The textbook comprises eight parts. Part 1 puts the unique properties of nano-size objects into perspective, explains classical and quantum dimensional effects. Part 2 describes carbon nanostructures, namely, fullerene molecules, fullerene-based structures, nanotubes, and the most promising carbon nanomaterial — graphene that have found a wide practical application. Part 3 introduces students to the principle of scanning probe microscope operation. Part 4 describes the technique of scanning probe microscopy, which allows studying the distribution of physical characteristics over the sample surface with nanoscale resolution. Part 5 discusses the principle of transmission electron microscope operation and its research potential. Part 6 introduces students to the scanning electron microscope technique and explains how the detectors of secondary and backscattered electrons, produced as a result of its interaction inside the sample, work. Part 7 describes the procedure of local elemental microanalysis that is carried out using an energy dispersion spectrometer embedded in a scanning electron microscope. Part 8 is devoted to the basics of micro- and nanoelectronics, it examines in detail the main stages of planar chip manufacturing technology. 5
CONTENTS 1. NANOTECHNOLOGIES AND NANOMATERIALS.................................... 7 2. NANOCARBON STRUCTURES .................................................................. 15 3. PRINCIPLE OF OPERATION OF THE SCANNING PROBE MICROSCOPE ................................................................................................... 31 4. VARIOUS SCANNING PROBE MICROSCOPY TECHNIQUES .............. 46 5. TRANSMISSION ELECTRONIC MICROSCOPY ...................................... 56 6. SCANNING ELECTRONIC MICROSCOPY ............................................... 65 7. ELECTRONIC PROBE X-RAY MICROANALYSIS .................................. 84 8. FUNDAMENTALS OF MICRO- AND NANOELECTRONICS ................. 97 6
1. NANOTECHNOLOGIES AND NANOMATERIALS Nanotechnology is a complex word comprising 2 components — technology and the nano. The nano means ten to the ninth power (10-9). The technology of any activity is a way of solving a specific task, a sequence of actions directed towards its implementation. A case in point could be manufacturing technology of a specific product. Today nanotechnology as well as biotechnology and information technology are one of the most modern, rapidly developing technologies. Moreover, experts believe that a nanotechnological revolution, which happened at the turn of the 21st century, can be compared in terms of importance with the computer revolution of the second half of the 20th century. Now nanotechnology is evolving at an unprecedented pace, enormous material and intellectual resources are invested in it all over the world. Nanotechnology achievements are growing rapidly, and in the future, they promise fantastic opportunities. Nanotechnology involves the understanding and control of matter at the nanometer-scale. The so-called nanoscale deals with dimensions between approximately 1 and 100 nanometers. The term “nanotechnology” was introduced in 1974 by the Japanese physicist Norio Taniguchi, who suggested using it to describe the work with objects less than one micron in size. Today, another classification of objects by their size has been adopted (Fig. 1.1). Figure 1.1. Size scale with examples of typical objects The figure shows three size ranges. At the macro-range, only the lower limit is indicated — 0.1 mm, it covers all objects around us, visible to the human eye, 7
except for the smallest ones. The upper limit of the macrorange is not marked in the figure; with increasing distances, it passes into other ranges, up to cosmic ones. Micro and nano ranges cover 3 orders of magnitude. The microrange corresponds to the size interval from 0.1 mm to 0.1 μm and includes all microorganisms, living cells and such small objects as a human hair. The upper limit of the nanoscale is 0.1 μm or 100 nm, and its lower limit of 0.1 nm corresponds to the diameter of the smallest atom, the atom of hydrogen. Thus, this range covers all atoms, all molecules up to such complex ones as the DNA molecule, and a great number of artificial molecules. This question will be discussed below. As you know, an atom, even the smallest one, is not the smallest particle in nature, it consists of even smaller objects, so the nanoscale is not the lowestdimensional scale. It is followed by the peak range from 0.1 nm to 0.1 pm and the femto range from 0.1 pm to 0.1 fm (the fractional femto prefix corresponds to 10–15). The laws of physics are equally true for all size ranges. But are there any fundamental differences between these ranges? It turns out that the differences between the nano-range and the other two are much more significant than the differences between the micro- and macro-ranges. For example, the manufacturing of objects or their parts in the last two ranges does not fundamentally differ. Though different tools are used, but the principles of their work are the same. For example, the vice is replaced by micromanipulators or micro-tweezers. Moving in both ranges can be done with the help of motors, adding gearboxes to them if necessary. At the same time, it is impossible to imagine the mechanical nanotweezers with which you can hold a molecule. So, to work in the nanoscale it is necessary to look for fundamentally different ways of fixing objects and their movements, which will be considered below. Control of objects and their observation in micro- and macro-ranges are mainly realized by optical methods in the visible range, while observations of micro-objects are carried out not directly with the eye, but with the help of an 8
optical microscope, for example. The wavelengths of visible light are shown in Fig. 1.1, they exceed the boundaries of nanoobjects, and the latter cannot be observed by optical methods. These limitations are due to diffraction effects, that cause the minimum half wavelength resolution, which is 200 nm. Thus, to observe nano-objects, other methods should be used, which will also be discussed below. In objects with macroscopic dimensions, the basic physical and chemical properties do not depend on the size; for nanoobjects, these properties can vary greatly. These nanoscale effects arise for several reasons. One of them is the increasing role of surface and surface forces. The structure and properties of surface atoms and molecules, as is known from the course of general physics, differ from the properties of atoms and molecules in volume. To estimate the fraction of surface particles, depending on the size of a nanoobject, consider it in the form of a sphere consisting of silver atoms. We will assume that 3 outer layers (which is quite a lot) have surface properties, the interatomic distance for Ag atoms is 0.3 nm. Let us first set the diameter of the object to be 10 nm. Then the fraction of surface particles is defined as the ratio of the volume of a spherical layer 0.9 nm thick to the total volume of the sphere (Fig. 1.2). Figure 1.2. Calculating the fraction of surface molecules In turn, the volume of the spherical layer is calculated as the difference between the total volume of the sphere and the volume of the inner sphere surface: 9
3 3 3 3 3 π 10 π 8,2 10 8,2 6 6 44,9% π 10 10 6 For a sphere with a diameter of 20 nm, similar calculations give 24.6%, 40 nm give 12.9%, 100 nm give 5.3%. Thus, at the edge of the nanoscale, the fraction of surface atoms is already insignificant. There are several examples of the manifestation of the considered effect. As you know, silver in the line of activity in Mendeleev’s periodic system is after hydrogen. Therefore, it does not interact with hydrochloric acid, however, silver nanoparticles interact with hydrochloric acid. Small particles of water that make up the fog do not fall down, but they are in suspension and tend to agglomerate. A decrease in the size of nanoparticles to a value of the order of 10 nm leads to a decrease in the melting temperature Tm by several tens of percent compared to bulk objects. With a further decrease in size to 1–2 nm, Tm decreases several times. Experimentally, this effect was observed in many metals, in particular, in Al, Ag, Au, Cu, Ga, In, Sn, etc. An important example is the improvement of heat removal from a conductor with a decrease in its cross section. So, for a cylindrical wire, the energy dissipated in it falls according to the same law as its volume changes - as R3, and the heat removal area — as R2, which is much slower. This makes it possible to bring the current density in the conducting paths of integrated circuits to values unattainable in macrodevices without damaging them. The listed examples can be attributed to classical size effects, in which the energy spectrum of charge carriers remains practically unchanged. Another important reason for size effects in the nanoscale is the manifestation of quantum effects, which is observed in the range of units to tens of nm, when the sample size becomes comparable to the de Broglie wavelength of charge carriers. As we know from quantum mechanics, isolated atoms are characterized by a discrete structure of the energy levels of electrons. The interaction of a large number of atoms in a macroscopic solid lead to energy levels splitting and the formation of quasi-continuous zones. As the size of the object (nanoparticle) 10