I want to do this in one synthetic step and preferably avoid the Sun method (successive layers). I also want to disperse these in water. thanks in advance.
Polysaccharides are sometimes used as capping agents .The link below may be useful.
http://www.sciencedirect.com/science/article/pii/S0144861714003117
Laser ablation in liquids: ablate an Iron target immersed in pure water or in a water-H peroxide mixture, modulating the laser beam parameters (mainly fluence at fixed wavelength around green), or ablate an Iron oxide target in ethanol (for instance).
However, be aware that the dominant oxide stoichiometry and crystal structure would strongly depend on process parameters
Hallo Kevin,
standard laser ablation in liquids usually produces spherical polycrystalline or amorphous NPs, due to the absence of any symmetry constrain. Adding a more or less "large" polymeric molecule in the liquid mixture may help in providing asymmetric NPs due to steric constraints during particle growth, but difficulties are to be expected because the additive must act in the ablation volume where the laser beam arrives and the ablation plume expands... that is the same additive molecules may be strongly modified during the process, Moreover, the steric effect occurs on growing particles, after nucleation, only when the involved molecules effectively surround the particles or even cap the same.
Some relatively recent studies, instead, show that laser ablation in liquid in presence of properly set electric or magnetic fields may favour some control on the shape of the NPs. I suggest you to search recent publications on that. An interesting review ican be found at the reference:Progress in Materials Science 87 (2017) 140–220
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