I am having some problems with Na+ ion exchange in my system, for this reason I can't use NaOH for control the pH. I just want to know what is the better pH for the growth of silver nanorods. Thank you!
It all depends on the reducing agent you are using. If the surface charge on the nanorods is positive, then alkaline pH would precipitate them. So a pH just before attaining agglomeration pH is suitable. Also keep a check on the ionic strength. A balance between ionic strength and buffer capacity needs to be worked out for proper growth. Maintain the balance by buffer, donot use NaOH. Actate buffer for acidic region and Phosphate buffer of low strength for alkaline and Neutal pH.
It all depends on the reducing agent you are using. If the surface charge on the nanorods is positive, then alkaline pH would precipitate them. So a pH just before attaining agglomeration pH is suitable. Also keep a check on the ionic strength. A balance between ionic strength and buffer capacity needs to be worked out for proper growth. Maintain the balance by buffer, donot use NaOH. Actate buffer for acidic region and Phosphate buffer of low strength for alkaline and Neutal pH.
As per my experience use pH in the range 6-8. Please have a look on following articles.
1. http://www.koreascience.or.kr/article/ArticleFullRecord.jsp?cn=JCGMCS_2012_v33n8_2592
2. http://pubs.rsc.org/en/content/articlelanding/2013/nr/c3nr00613a/unauth#!divAbstract
3. http://pubs.acs.org/doi/abs/10.1021/jp410063p
4. http://www.sciencedirect.com/science/article/pii/S0021979714004457
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