HACN0042
Crystallography
Ch.0 Course Introduction
Ho Young Kim (HACN0042)
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TEM 사진 → 나노 결정!
Welcome to HACN0042
Crystallography
5 nm
1 nm
✓ Time: Mon 16:00-18:00 & Thurs 16:00-17:00
✓ Location: N203 (Mon) & N201 (Thurs)
Ho Young Kim (HACN0042)
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Instructor
Dr. Ho Young Kim (김호영)
▪ Dept. of Chemistry & Energy Engineering
▪ Office: N509
▪ Phone: 02-2287-5283 ← 학과 사무실 번호래 아직 내선 번호가 없으시대
▪ E-mail: hoykim@smu.ac.kr
▪ Office Hour: by appointment
▪ Lecture notes will be uploaded on portal.
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Textbook
Contents
▪ Chemical Bond (화학 결합)
▪ Atomic Packing (원자 충전)
▪ Crystal Lattice (결정 격자)
▪ Symmetry & Group Theory (대칭성과 군론)
▪ Crystal Structure (결정 구조)
▪ Crystal Defect (결정 결함)
▪ X-Ray Diffraction (X-선 회절)
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Grading
Grading will be generous!
▪ Attendance: 20% (default score)
▪ No homework, no quiz! (in principle)
▪ Mid-term: 40%
▪ Final: 40%
▪ Extra credit:
perfect attendance (1 grade)
essay (optional, to be opened after mid-term)
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Class Policies
Mutual Respect!!!
▪ 수업 구성: 지난 시간 summary (5분) 후 강의 진행
▪ 출석 이슈: 수업 1 시간 전 e-mail
▪ 질문: e-mail & 오피스 방문(N509, appointment)
▪ 신규 공지사항: 문자 메시지 & e-mail
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Crystallography: What Is a Crystal?
Solid-State Materials
crystalline
amorphous
Examples of Crystals
metal
salt
protein
gold
NaCl
hemoglobin
▪ Crystallography: a scientific discipline that understands structure of crystals
▪ Crystal: 3D structure having repeated patterns of components (atom, molecule)
▪ Arrangement: crystalline → regular vs. amorphous → random
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Why We Study Crystallography?
PtCo Crystal Structure
Graphite vs. Diamond
Pt
vs.
element
Co
Graphite
Component
atomic
arrangement
atomic
interaction
Diamond
Carbon
Color
Black
Colorless
Hardness
Soft
Hard
Electrical
Conductivity
Conductor
Inductor
▪ Our interests: element, atomic arrangement, and atomic interaction
▪ Crystal structure: a key for comprehending the materials’ properties
Ho Young Kim (HACN0042)
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Crystal Structure
Graphite Crystal Structure
Diamond Crystal Structure
Message
❖ Crystal structure:
meticulous classification & understanding
→ prediction of materials’ properties!
▪ Graphite: stack of atomic layers with a hexagonal arrangement
▪ Diamond: 3D-connected structure of tetrahedral arrangement
▪ Crystal structure can dictate the materials’ physicochemical properties!
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Crystal Structure: Classification
Concept of Unit Cell
Classification of Unit Cell
Crystal
Systems
unit cell
crystal
Criterion
Number of Items
Geometry
7
Bravais
Lattices
Geometry +
Point
Groups
Geometry +
Space
Groups
Bravais Lattices +
14
Centering
32
Symmetry
Point Groups
230
▪ Unit cell: the smallest repeating unit that makes up the crystal
▪ Classification: performed based on the geometry and symmetry of unit cell
Ho Young Kim (HACN0042)
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Crystal Structure: Understanding
X-Ray Diffraction (XRD) Pattern
Transmission Electron Microscopy (TEM) Image
10 nm
H. Y. Kim et al.,
Chem. Eng. J. 2023, 476, 146662.
H. Y. Kim et al.,
Nano Lett. 2020, 20, 7413.
▪ XRD: structural factors of crystals (geometry and size)
▪ TEM: direct observation of the atomic arrangement
▪ These techniques enable rational design of functional nanocrystals!
Ho Young Kim (HACN0042)
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Application of Crystallography
Crystallography: Multidisciplinary Study
Physics
Various Applications
Chemistry
Crystallography
Materials
Science
Biological
Science
Semiconductor
Electronic Device
Medical Biology
Energy Application
▪ Especially, crystallography plays a pivotal role in energy materials!
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Application of Crystallography: Example
XRD Patterns
Catalytic Performance
structural
transformation
H. Y. Kim et al., Nano Lett. 2020, 20, 7413.
▪ Structural transformation: PtCu cubic → PtCu rhombohedral
▪ Pt–Cu interaction: rhombohedral > cubic
▪ Catalytic performance: rhombohedral > cubic
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Summary
N. Jones, Nature 2014, 505, 603.
▪ Scientific discipline that understands crystal structure
▪ Closely related to understanding of materials’ properties
▪ Important cornerstone for scientific advancement
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My Research Interests
Solid-State
Nanomaterials
Heterogeneous
Catalysis
Energy Conversion
Devices
O2
H2O
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My Favorites, Other Than Chemistry
My Baby Dog
“Watching” Football
Leather Art
Drinking Alcohol
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Q&A
Ho Young Kim, Ph. D
Thank
You!
SMU, Seoul
hoykim@kist.re.kr
Ho Young Kim (HACN0042)
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Ho Young Kim, Ph. D
Thank
You!
N509, SMU, Seoul
hoykim@smu.ac.kr
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