2012 Pearson Educalion.Inc Figure 12.45 Stained glass window from the Chartres Cathedral in France
Figure 12.45 Stained glass window from the Chartres Cathedral in France
Nanoscale materials (2)表面与界面效应：纳米晶体粒表面原子数与总原子数之比随粒径变小而 急剧增大后所引起的性质上的变化。 The percentage of TABLE 2.1 The relation between the total number of atoms in full surface atoms shell clusters and the percentage of surface atoms Full-shell Clusters Total Number Surface Atoms of Atoms (% 1 Shell 13 92 2 Shells 55 76 3 Shells 147 63 4 Shells 309 52 5Shells 561 45 7Shells 1415 35 Cited from Nanoscale Materials in Chemistry; Edited by Kenneth J.Klabunde
（2）表面与界面效应：纳米晶体粒表面原子数与总原子数之比随粒径变小而 急剧增大后所引起的性质上的变化。 Nanoscale materials The percentage of surface atoms Cited from Nanoscale Materials in Chemistry; Edited by Kenneth J. Klabunde
Nanoscale materials in chemistry Particle radii Number of atoms Percentage of surface atoms 10nm 4000 40% 1nm 30 99% 100 20 0 10 2030 4050 粒度nm Ex.Gold particles between 2 to 3 nm in diameter becomes chemically active
Nanoscale materials in chemistry Particle radii Number of atoms Percentage of surface atoms 10nm 4000 40% 1nm 30 99% Ex. Gold particles between 2 to 3 nm in diameter becomes chemically active
Nano-Materials (3)量子尺寸效应：当粒子的尺寸达到纳米量级时，费米能级附 近的电子能级由连续态分裂成分立能级。当能级间距大于热能、磁 能、静电能、静磁能、光子能或超导态的凝聚能时，会出现纳米材 料的量子效应，从而使其磁、光、声、热、电、超导电性能变化。 量子点-Quantum dots What is a quantum dot? ·Nanocrystals ·2-10 nm diameter ·semiconductors Core-Shell EviDot
Nano-Materials （3）量子尺寸效应：当粒子的尺寸达到纳米量级时，费米能级附 近的电子能级由连续态分裂成分立能级。当能级间距大于热能、磁 能、静电能、静磁能、光子能或超导态的凝聚能时，会出现纳米材 料的量子效应，从而使其磁、光、声、热、电、超导电性能变化。 量子点-Quantum dots
Nano-Materials (3)量子尺寸效应：当粒子的尺寸达到纳米量级时，费米能级附 近的电子能级由连续态分裂成分立能级。当能级间距大于热能、磁 能、静电能、静磁能、光子能或超导态的凝聚能时，会出现纳米材 料的量子效应，从而使其磁、光、声、热、电、超导电性能变化。 量子点(Quantum dots):the band gaps of a quantum dot will change greatly when its diameter is adjusted between 1-10 nm CB As particle gets smaller, the band gap gets bigger. VB Semiconductor
Nano-Materials （3）量子尺寸效应：当粒子的尺寸达到纳米量级时，费米能级附 近的电子能级由连续态分裂成分立能级。当能级间距大于热能、磁 能、静电能、静磁能、光子能或超导态的凝聚能时，会出现纳米材 料的量子效应，从而使其磁、光、声、热、电、超导电性能变化。 量子点(Quantum dots): the band gaps of a quantum dot will change greatly when its diameter is adjusted between 1- 10 nm As particle gets smaller, the band gap gets bigger