2013/10/25 by Kiruthiga Jagadeesan, Jagadeesan, Kiruthiga, A. C. Chatterji +1
Chemistry · Engineering · Materials Science · #Electrostatics and Colloid Interactions #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Nanopore and Nanochannel Transport Studies #Quantum Dots Synthesis And Properties #Soft Condensed Matter (cond-mat.soft)
paper · pdf · doi:10.48550/arxiv.1310.6840
openalex publication_date 2013/10/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present investigate the self assembly and growth of an array of CdS nanotubes: a consequence of a fine balance of directed motion, diffusion and aggregation of reacting \rm Cd+2 and \rm S-2 ions. In a previous communication [J. Kiruthiga, A. Chatterji, J. Chem. Phys., \bf 138 024905 (2013)], we identified the mechanism of a unexpected growth of a very uniform CdS nano-cylinder from the end of a nano-channel. Furthermore, the cylinder had a pore along the axis but were closed at one end. This unique phenomenon of self assembly of \em monodisperse CdS nano-cylinders had been observed in a rather simple experiment where two chambers containing 0.1 M \rm Cd Cl2 and 0.1 M \rm Na2 S solutions were joined by an array of anodized aluminium oxide (AAO) nano-channels [A. Varghese, S. Datta, Phys. Rev. E., \bf 85, 056104 (2012)]. Our previous study identified the principles governing the growth of a single nano-tube at the exit point of a single AAO-nano-channel. In this communication, we identify factors affecting the self-assembly process for nano-tubes growing out an array of closely spaced AAO nano-channel exits. Our model is not Cd+2 or S2- specific, the experimental scheme can be extended to self assemble a general class of reacting-diffusing A and B ions with A (\rm Cd+2) selectively migrating out from a nano-channel. In particular, we note that after the initial prolonged growth of nanotubes, there can arise a severe deficiency of B-ions (\rm S-2) ions near the AAO-nano-channel exits, the points where the reaction and aggregation occurs to form the CdS nanotube, thus impeding further growth of uniform CdS nano-tubes. Thereby we predict the necessary characteristics of reacting systems which can be self assembled using suitable adaptations of previous experiments.