Summary
Supported on carbon particles using the high energy electron beam
Yuji Ohkubo, Masashi Shibata, Satoru Kageyama, Satoshi Seino, Takashi Nakagawa,Junichiro Kugai, Takao A. Yamamoto (2011) in their study of the Radiation-induced synthesis of Au–Pd nanoparticles of random alloy structure supported on carbon particles using the high energy electron beam found that Au-pd particle of ca 5-nm dispersed well on the carbon surface with ca. 30-nm without a significant agglomeration. Upon adding citric acid to the original solution, the resulting high pH was effective in the formation of alloy structures from the resulting bimetallic nanoparticles.
Using the irradiation method, they made a solution with the metal ions. After testing different pH of the solutions, the researchers successfully produced Au-Pd bimetallic nanoparticles that were supported by carbon particles with a pH control. The EXAFS and XRD analysis showed that the structure of the bimetallic nanoparticles changed by adding sodium hydroxide and citric acid in the solution with the metals ions. All the results showed that the high PH had an effective production of bimetallic nanoparticles.
The results, would therefore, guide on the one-pot synthetic bimetallic production method in two ways.
The irradiation of the high energy electron beam so as to get over differences resulting from the reduction potentials of two ions.
Controlling the pH to promote the activity of the metal agent complexing
Gamma radiation induced distribution of gold nanoparticles
into carbon nanotube-polyaniline composite
Kwang-Pill Lee, Anantha Iyengar Gopalan, Padmanabhan Santhosh, Se Hee Lee, and Young Chang Nho (2005) studied the Gamma radiation-induced distribution of gold nanoparticles into carbon nanotube-polyaniline composite. The researchers using a one-pot y-radiation as the initiator of polymerization and the generation of nanoparticles, prepared composites of single-wall nanoparticles, gold nanoparticles, and polyaniline.
They managed to produces nanocomposites SWNT–PANI–Au–NC (wall carbon nanotube-polyaniline-Au) using the one-pot synthesis. They did not use conventional oxidizing agents. In their conclusion, they noted that they irradiation could establish SWNT, Au nanoparticles, and polyanline in the one-pot synthesis. Thy further suggests that scientists could extend their method for other multi-various combinations to come up with other nanocomposites. The nanocomposites formed may find application as sensors in microelectronics devices and as catalysts in various reactions.
In Situ γ-Radiation: One-Step Environmentally
Benign Method To Produce Gold-Palladium
Bimetallic Nanoparticles
Kamalika Roy and Susanta Lahiri (2008) researched on the In Situ γ-Radiation: One-Step Environmentally Benign Method To Produce Gold-Palladium Bimetallic Nanoparticles. Susanta and Kamalika formed a Gold solution with AU and mixed it with a PdCl2 solution that had been measured in 50% polyethylene glycol mixture. As results, nanoparticles formed due to the radiolysis of the resulting polymer solution. Further, the results had showed that after carrying out a spectrophotometric analysis, a broad absorption took place in the solution containing Pd (II) and Au (III) with no absorptions of the gold nanoparticles. Further, the absence of the peak at 310 nm was an indication of unreduced Au (III) and 325 and 440 of unreduced Pd (II) showed that there was a complete reduction of metal ions and, therefore, the formation of bimetallic nanoparticles having both the Pd and Au.
They concluded that PEG system made an environmental benign procedure of coming up with gold palladiums bimetallic nanoparticles. Further, their method is safer and uses little amounts of the chemical. On top of that, their method was easy for the production of nanoparticles. Under mild solvent free conditions, the gold palladium may act a catalyst for the remediation of some critical pollutants of the environment, such as the organs halogen.
