Self-Assembling of Nanoparticles in the form of Double Linear Chains and Superlattices on their Basis
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SELF - ASSEMBLING OF NANOPARTICLES IN THE FORM OF DOUBLE LINEAR CHAINS AND SUPERLATTICES ON THEIR BASIS R.T. Malkhasyan*, R.K. Karakhanyan*, M.N. Nazaryan*, C. Sung**. *Scientific – Production Enterprise “Atom”, Tevosyan str. 3/1, Yerevan 375076, Armenia. [email protected] **University of Massachusetts, Lowell M.A. ABSTRACT The self-assembling systems in nanoscale powders of crystalline MoO3 are disclosed. For the first time, the double linear chain aggregates of the MoO3 nanoparticles were revealed in nanoscale powders of MoO3 , treated by vibrationally excited molecules of hydrogen. Double linear chain aggregates form a linear and an orthogonal supperlattices. Both the double linear chain aggregates and the supperlattices formed are being considered as selfassembling systems. The treatment of the powders by the molecules of hydrogen is a method of obtaining long self-assembling chains of inorganic materials and supperlattices on their basis. INTRODUCTION Disclosuring the new self-assembling systems is an important problem of materials science [1-4]. The development of the advanced technology for the treatment of the nanosized powders can lead to a formation of self-assembling nanostructures. In [5-8] a new technology is proposed for the preparation of the amorphous single-component metals. This new technology, termed as “quantum-chemical”, is based on carrying out nonequilibrium chemical processes where vibrationally excited molecules of hydrogen take part. The purpose of the present work is to obtain the new self-assembling systems in nanoscale powders of MoO3 treated by quantum-chemical technology, i.e. by vibrationally excited molecules of hydrogen. EXPERIMENTAL A fine dispersive powder of molybdenum oxide MoO3 with grain size less than 50µm had been installed into the inclined evacuated reactor, which was evacuated to pressure below 10-4 Torr. Upon gaining the above-mentioned pressure, the vibrationally excited molecules of hydrogen generated in the close proximity from the reactor’s active zone were injected and the hydrogen molecules interacted with the MoO3 nanoparticles. Hydrogen molecules at the third quantum level with the excitation energy 1,5±0.2 eV were used. The investigation of MoO3 powders was carried out on the transmission electron microscope TESLA BS 500 at the accelerating voltage of 90 kV. To prepare the samples, 1-2 drops of MoO3 powder suspension in hexane was drifted on the copper grid with carbon coat. RESULTS AND DISCUSSION Electron microscopic investigations showed that during an intense electron irradiation, an ejection of the MoO3 nanoparticles from their agglomerates took place. The MoO3 nanoparticles, which ejected under the influence of intense electron irradiation on the carbon coat, are distinctly seen in Fig. 1. The minimal size of those nanoparticles is about 5 nm.
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Fig. 1. The MoO3 aglomerates with ejected nanoparticles. During the ejection, the microstructure of agglomerates, previously unknown, was revealed. Particularly, the long double linear chain aggregates
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