Introduction to Nanotechnology

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8.2. INFRARED FREQUENCY RANGE 209 is referred to as the D band. The D band has been attributed to phonons that are Raman-active because of the finite size of the microcrystals. Figure 8.19 presents a series of Raman spectra from various forms of crystalline graphite, as well as spectra from four samples of amorphous carbon with graphitic features. These spectra can be used to assess the degree of disorder and the nature of the local chemical bonding. The log-log plot of Fig. 8.20 shows how the nanocrystal size La is related to the intensity ratio ID/IG of the D band to the G band. The linearity extends over two orders of magnitude, from La = 3 nm to La = 300 nm. The nanocrystallite sizes for the data plotted in Fig. 8.20 had been independently determined from X-ray scattering data. .- 2. c ln C a c - C ._ a > I - m 2 GRAPHITIC CARBON 1580 Polycrystalline Graphite 271 0 1580 \ u Natural Graphite Crystal 30 1000 1500 2000 2500 3000 Wavenumber (a) 1343 1 IT AMORPHOUS CARBON Glassy Carbon Diamond-Like Carbon Wavenumber (b) Figure 8.19. Raman spectra of (a) crystalline graphites and (b) noncrystalline, mainly graphitic, carbons. The D band appears near 1355cm-’ and the G band, near 1580cm-’. [From D. S. Knight and W. B. White, J. Mater, Sci. 4, 385 (1989).]
210 OPTICAL AND VIBRATIONAL SPECTROSCOPY 10 I I I I IIIII I I I I 1 1 1 1 1 0.01 0.1 1 5 Figure 8.20. Plot of the relation between the graphite particle size La and the Raman Pband to G-band intensity ratio $/IG on a log-!og scale. The straight line is a least-squares fit to the data pain$ that provided the linear relationship L,=4.4 /G//D, where La is expressed in namometers (10A= 1 nm). [From D. S. Knight and W. 6. White, J. Mater Sci. 4, 385 (1989).] 8.2.4. Brillouin Spectroscopy Brillouin scattering is a type of Raman scattering in which the difference frequency Aw = w~~~~~~ = (qnc - w,,,~) corresponds to the acoustic branch of the phonon dispersion curves, with frequencies in the gigahertz (x lo9 Hz) range, as was explained in Section 3.4.1. The negative and positive signs in the expression above for cL)pho,,on correspond to Stokes and anti-Stokes lines, respectively. Brillouin scattering has been used to study carbon films, and Fig. 8.21 compares the spectra of thick and thin films. The thick-film result (a) provides a bulk material response, namely, a strong central peak at zero frequency about 10 GHz wide, and a broad peak near 17 GHz attributed to longitudinal acoustic (LA) phonons. This latter frequency is consistent with the elastic moduli of carbon, which are measures of the stretching capability of solid carbon and its chemical bonds. The dotted line experimental spectrum of the lOOnm thick film at the top of Fig. 8.21b exhibits three peaks which come at positions close to the solid line theoretical spectrum Figure 8.21. Brillouin spectra of (a) thick carbon film showing a Lorentzian fit to the data and (b) 100nm thin carbon film. The upper experimentally measured spectrum of (b) is compared to the lower calculated spectrum, which does not take into account the scattering due to surface and structural irregularities that broaden the experimental spectrum. [From P. Milani and C. E. Bottani, in Nalwa (2000), Vol. 2, Chapter 4, p. 262.1
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INTRODUCTION TO NANOTECHNOLOGY Char
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CONTENTS Preface xi 1 Introduction
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5.2 Carbon Molecules 103 5.2.1 Natu
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9.4 Excitons 244 9.5 Single-Electro
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PREFACE In recent years nanotechnol
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INTRODUCTION The prefix nano in the
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INTRODUCTION 3 he recognized the ex
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1000 (I) a 900 4 800 a 900 I 6 700
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INTRODUCTION 7 developed before the
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2.1. STRUCTURE 9 mechanics, the res
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X T 2.1. STRUCTURE 11 Figure 2.4. C
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2.1. STRUCTURE 13 Figure 2.6. Thirt
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Sodium Nanoparticle Na, Magic Numbe
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2.1. STRUCTURE 17 of the large anio
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2.1. STRUCTURE 19 other, and high-f
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2.2. ENERGY BANDS 21 Conduction Ban
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2.2. ENERGY BANDS 23 Figure 2.13. S
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2.2. ENERGYBANDS 25 band at point T
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A X ' Wavevector A Si c z 2.2. ENER
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2.2. ENERGY BANDS 29 bands of Figs.
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2.3. LOCALIZED PARTICLES 31 add ele
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1 meV 10 meV 100 meV FJ E W 1 eV 10
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3 METHODS OF MEASURING PROPERTIES 3
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3.2. STRUCTURE 37 Table 3.1. Crysta
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3.2. STRUCTURE 39 Figure 3.2. Two-d
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3.2. STRUCTURE 41 The widths of the
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44 METHODS OF MEASURING PROPERTIES
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3.3. MICROSCOPY 51 types of transit
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3.3. MICROSCOPY 53 Actual diverging
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Tunneling current Tunneling current
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3.3. MrCAOSCOPY 57 and the latter m
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3.4. SPECTROSCOPY 59 From Eq. (3.8)
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1 Average Panicle FWHM Size (nm) in
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CdSe colloidal NCs a = 1.2 nrn 3.4.
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El X-RAY TUBE 8000 - A 6000 - 4000
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2 N I w 3.0 2.5 2.0 1.5 1 .o 0.5 3.
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i 3.4. SPECTROSCOPY 69 NMR involves
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T=220K - 2G H FURTHER READING 71 Fi
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NUMBER OF ATOMS RADIUS (nm) 1 10 1
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I L 7 3 5 7 9 11 13 15 17 NUMBER OF
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JELLIUM MODEL OF CLUSTERS ATOMS CLU
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1.02 { 1.01 - 1 - 0.99 - 4.2. METAL
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4.2. METAL NANOCLUSTERS 81 Figure 4
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4.2. METAL NANOCLUSTERS 83 Figure 4
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-0 100 200 300 400 500 600 MASSICHA
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a 42. METAL NANOCLUSTERS 87 Figure
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. . . .. . - . D 111111111111111111
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3 4 2.5 0 cn g 2 0 z d 1.5 t a 9 1
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4.3. SEMICONDUCTING NANOPARTICLES 9
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4.4. RARE GAS AND MOLECULAR CLUSTER
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4.5. METHODS OF SYNTHESIS 97 d Figu
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4.5. METHODS OF SYNTHESIS 99 isopro
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PULSED LASER BEAM 1 1 1 1 1 I ROTAT
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5.1. INTRODUCTION CARBON NANOSTRUCT
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5.2. CARBON MOLECULES 105 methane d
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5.3. CARBON CLUSTERS 107 -0 20 40 6
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PHOTON ENERGY (electron volts) 5.3.
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Figure 5.6. Structure of the CEO fu
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1 30 0 14.1 14.2 14.3 14.4 14.5 LAT
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(c) 5.4. CARBON NANOTUBES 115 Figur
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5.4. CARBON NANOTUBES 1 17 The mech
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5.4. CARBON NANOTUBES 11 9 investig
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5.4. CARBON NANOTUBES 121 energy gr
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5.4. CARBON NANOTUBES 123 stretch c
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5.5. APPLICATIONS OF CARBON NANOTUB
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- v) 450 : 400 3 350 1 300 : 5 250
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BULK NANOSTRUCTURED MATERIALS In th
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h 8 0 6.1. SOLID DISORDERED NANOSTR
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6.1. SOLID DISORDERED NANOSTRUCTURE
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6.2. NANOSTRUCTURED CRYSTALS 153 qu
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6.2. NANOSTRUCTURED CRYSTALS 155 Fi
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Page 181 and 182: 170 NANOSTRUCTURED FERROMAGNETISM M
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Page 190 and 191: 4 h $ 3 7.5. NANOCARBON FERROMAGNET
Page 192 and 193: 7.6. GIANT AND COLOSSAL MAGNETORESI
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Page 196 and 197: 7.6. GIANT AND COLOSSAL MAGNETORESI
Page 198 and 199: 7.7. FERROFLUIDS 187 Figure 7.22. M
Page 200 and 201: 7.7. FECIROFLUIDS 189 Figure 7.25.
Page 202 and 203: 7.7. FERRQFLUlOS 191 FerroRuids can
Page 204 and 205: FURTHER READING FURTHER READING 193
Page 206 and 207: 10- IR f IA -1 8.1. INTRODUCTION 19
Page 208 and 209: 8.2. INFRARED FREQUENCY RANGE 197 1
Page 210 and 211: 8.2. INFRARED FREQUENCY RANGE 199 d
Page 212 and 213: s C CTI e 8 9 4( 8.2. INFRARED FREQ
Page 214 and 215: 8.2.3. Raman Spectroscopy 8.2. INFR
Page 216 and 217: 8.2. INFRARED FREQUENCY RANGE 205 a
Page 218 and 219: - r I 520 51 8 v 6 516 a" 51 4 51 2
Page 222 and 223: v) - C 3 8 600 400 100 0 e e 10 20
Page 224 and 225: i E (cm-’ ) 20 c I 1 ID 0 4x107 8
Page 226 and 227: - ? m v .- - z In C a, c C - .. . .
Page 228 and 229: Excitatior I [eV]: 2.175 2.214 2.25
Page 230 and 231: 6 100 200 300 Time (ns) 8.3. LUMINE
Page 232 and 233: 400 nm Laser / Free excitons Trappe
Page 234 and 235: 8.4. NANOSTRUCTURES IN ZEOLITE CAGE
Page 236 and 237: FURTHER READING 225 P. Milani and C
Page 238 and 239: 9.2. PREPARATION OF QUANTUM NANOSTR
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Page 242 and 243: 9.3. SIZE AND DIMENSIONALITY EFFECT
Page 248 and 249: w n 3 2 1 9.3. SIZE AND DIMENSIONAL
Page 254 and 255: WE) Quantum Dot Number of Electrons
Page 256 and 257: 9.5. SINGLE-ELECTRON TUNNELING 245
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Page 264 and 265: 9.7. SUPERCONDUCTIVITY 253 horizont
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10.1. SELF-ASSEMBLY 259 factor of 2
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(a) (LI (dl 10.1. SELF-ASSEMBLY 261
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10.1. SELF-ASSEMBLY 263 atoms, as n
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- c v) ._ C 3 2 9 40 c - .- e m v w
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10.2. CATALYSIS 267 where the lengt
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10.2. CATALYSIS 269 are also other
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1600 2 1200 t p - Bi2M020, 10.2. CA
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7 - I 2,330 m .- c r 0 2 2,300 - u)
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10.2. CATALYSIS 275 with a top and
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10.2. CATALYSIS 277 based on the pr
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10.2. CATALYSIS 279 CnHlnfl, which
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I1 ORGANIC COMPOUNDS AND POLYMERS 1
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11.2. FORMING AND CHARACTERIZING PO
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1 1.3. NANOCRYSTALS 285 This expres
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-1 5 0) C a, -1 1 000 300 100 30 10
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11.3. NANOCRYSTALS 289 Table 11.1.
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11.3. NANOCRYSTALS 291 R’ groups
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11.4. POLYMERS 293 Figure 11.9. Ske
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11.5. SUPRAMOLECULAR STRUCTURES 295
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M Et3P OTf M=Pd M=Pt M=Pd, 41 % M=P
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11.5. SVPRAMOLECUUAR STRUCTURES 2s
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11 5. SUPRAMOLECULAR STRUCTURES 303
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BiodegradaWe surface 4 Functional g
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FURTHER READING 309 F. J. Owens and
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12.2. BIOLOGICAL BUILDING BLOCKS 31
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314 BIOLOGICAL MATERIALS which we w
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316 BIOLOGICAL MATERIALS Table 12.2
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318 BIOLOGICAL MATERtALS i J / Flgu
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320 BIOLOGICAL MATERIALS Pyrimidine
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322 BlOLMjlCAL MATERiALS (a) DNA do
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324 BIOLOGICAL MATERIALS so each wo
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326 BIOLOGICAL MATERIALS 12.4.2. Mi
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328 BIOLOGICAL MATERIALS tions they
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330 BIOLOGICAL MATERIALS hardened f
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13 NANOMACHINES AND NANODEVICES In
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334 NANOMACHINES AND NANODEVICES CA
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336 NANOMACHINES AND NANODEVICES Op
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338 NANOMACHINES AND NANODEVICES ti
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340 NANOMACHINES AN0 NANODEVICES PO
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342 NANOMACHINES AND NANODEVICES X
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344 NANOMACHINES AND NANODEVICES na
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346 NANOMACHINES AND NANODEVICES 31
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348 NANOMACHINES AND NANODEVICES -
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350 NANOMACHINES AND NANODEVICES re
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352 NANOMACHINES AND NANODEVICES 1
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354 NANOMACHINES AND NANODEVICES -1
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A.l. INTRODUCTION APPENDIX A FORMUL
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A.3. PARTIAL CONFINEMENT 359 limiti
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APPENDIX B TABULATIONS OF SEMICONDU
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TABULATIONS OF SEMICONDUCTING MATER
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Table B.8. Effective masses m+ rela
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372 INDEX amoeba, 3 16 amphiphilic,
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374 INDEX CdS, 9, 130, 213, 216, 36
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376 INDEX dispersion, 277 disulfide
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378 INDEX Ga (gallium) (continued)
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380 INDEX length (continued) critic
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382 INDEX multiple ionization, 93 r
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384 INDEX pi-conjugation, 282, 292
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silica, 269 silica-alumina, 269, 27
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388 INDEX wavefimction (continued)
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Introduction to Nanotechnology

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