1. Synthesis of SnO nanocrystals with shape control via ligands interaction and limited ligand protection Kangkang Mena , Jiajia Ninga ,b .Quanqin Daic, Dongmei Lia , Bingbing Liua, William W. Yuc,∗ , Bo Zoua,∗∗ Colloids and Surfaces A: Physicochem. Eng. Aspects 363 (2010) 30–34
報告學生: 蔣昆璋
指導教授: 王聖璋 老師

2. 目 錄 前言
實驗流程
結果與討論 結論
未來工作

3. 前 言
In the past decades, metal oxide nanocrystals have attracted much attention because of their widely potentials in many fields.
A number of metal oxide nanostructures have been produced for their applications in catalysis, sensor, energy storage and conversion, magnet and optics. Among these metal oxides, SnO and SnO2 have attracted much attention for their potential application in high energy density rechargeable lithium ion battery .

4. 實 驗 流 程 SnCl2 Oleylamine 1-octadecene ( 0.9072 g) 1000C ~ 1600C 10 min
0.8 mmol
( g)
Oleylamine
7.2 mmol
( g)
1-octadecene ( g) 氮氣
1000C ~ 1600C
10 min
20 ul
去離子水 甲苯 離心
TEM
XRD
FTIR
HRTEM

5. 結 果 與 討 論
Fig. 1. TEM images of as-prepared SnO nanocrystals by injecting 20 ul of water into precursor solution at different temperature: (a) and (b) corresponding to 100 ◦C; (c) and (d) corresponding to 120 ◦C; (e) and (f) corresponding to 140 ◦C; (g) and (h) corresponding to 150 ◦C.

6. Fig. 2. TEM images of nanorings (a) and SEM images of nanorings, nanorings are produced by injecting 20 ul of water at 160 ◦C.

7. Fig. 3. XRD patterns of as-prepared samples.
Fig. 4. XRD patterns of tin oxide hydroxide (a), mixture of tin oxide hydroxide and tin oxide (b) and SnO nanocrystals (c).
Sn6O4(OH)4 (JCPDS no ).
SnO (JCPDS no ).

8. Fig. 5. HRTEM images (a) and SAED images (b) of single nanosheets.

9. Fig. 6. FTIR spectrums of ligands (OLA) and SnO nanocrystals capped with ligand.

10. Fig. 7. Schematic of the formation process of SnO nanocrystals

11. 結 論
These nanocrystals are transformed from Sn6O4(OH)4. With increasing the reaction temperature, layer-nanoplates gradually become to individually round nanosheets, and nanosheets aggregated to nanorings at higher temperature. Complex structure disassembles to its basic unit and then these units assemble to novel complex structure again. The changes in morphologies and size of SnO nanocrystals with increasing temperature are explained by the effect of ligand. The ligand interaction mechanism is proposed to explain disassemble of nanocrystals, and ligand protection mechanism is used to explain the formation of nanorings.

12. 未 來 工 作
Paper review
實驗進度