Alkyl and Aromatic Amines as Digestive Ripening/Size Focusing Agents for Gold Nanoparticles
Abstract
:1. Introduction
2. Experimental Methods
2.1. Materials
2.2. Preparation of Au-alkylamine Colloids by the Ion Reduction/Inverse Micelle Method. Specific Methods for Gold Nanoparticles
2.2.1. Preparation of the Crude Gold Colloid
2.2.2. Digestive Ripening
2.3. Preparation of Au-butylamine, Au-octylamine, Au-dodecylamine, Au-hexadecylamine, Au-octadecylamine as Prepared Colloids by SMAD Method
2.3.1. Preparation of the Condensing Solvents
2.3.2. Preparation of the as Prepared Gold Colloid
2.3.3. Digestive Ripening
2.4. Characterization
2.4.1. UV-Vis Spectroscopy
2.4.2. Transmission Electron Microscopy
3. Results and Discussion
3.1. Gold-Amine by Inverse Micelle Method: The Effect of Alkyl Chain Length
3.2. Gold-Amine by the SMAD Method: The Effect of Alkyl Chain Length, Comparison between Inverse Micelle and SMAD Method
3.3. Comparison between Alkylthiol and Alkylamine as the Capping Ligand for Gold Colloids
3.4. Summary of Alkyl Amines
3.5. Aromatic Amines (More Reactive than Alkyl Amines)
3.5.1. Gold-Aniline Colloid in Butanone System
3.5.2. Gold-Aniline Colloid in Toluene System
3.5.3. Gold-Pure Aniline Colloids
3.5.4. Gold-Phenethylamine Colloids
3.5.5. Summary of Aromatic Amines
4. Conclusions
- (1)
- Amines are useful capping ligands for gold nanoparticles, and stabilize as Au-NH2R bonds without loss of hydrogen;
- (2)
- Amines and thiols are good digestive ripening solvents, although thiols are the better of the two;
- (3)
- With inverse micelle produced particles, all amines behave as good digestive ripening agents;
- (4)
- With SMAD produced particles, only selected amines (C12H25NH2, C6H5–NH2, C6H5CH2CH2NH2) serve to digestively ripen the particles, while other alkyl amines were less favorable. Reactivity and chain length are both important;
- (5)
- Inverse micelle prepared particles are more reactive and susceptible to digestive ripening than SMAD prepared.
Acknowledgements
Conflict of Interest
References
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Sun, Y.; Jose, D.; Sorensen, C.; Klabunde, K.J. Alkyl and Aromatic Amines as Digestive Ripening/Size Focusing Agents for Gold Nanoparticles. Nanomaterials 2013, 3, 370-392. https://doi.org/10.3390/nano3030370
Sun Y, Jose D, Sorensen C, Klabunde KJ. Alkyl and Aromatic Amines as Digestive Ripening/Size Focusing Agents for Gold Nanoparticles. Nanomaterials. 2013; 3(3):370-392. https://doi.org/10.3390/nano3030370
Chicago/Turabian StyleSun, Yijun, Deepa Jose, Christopher Sorensen, and Kenneth J. Klabunde. 2013. "Alkyl and Aromatic Amines as Digestive Ripening/Size Focusing Agents for Gold Nanoparticles" Nanomaterials 3, no. 3: 370-392. https://doi.org/10.3390/nano3030370