Technology of manufacturing star-shaped gold nano system mastered
Chairman Dr. Nguyen Thanh Danh and X-ray photoelectron spectroscopy - XPS equipment in Prague
Research and application of plasmonic metal nanoparticles
Plasmonic metal nanoparticles such as gold nanoparticles (AuNPs) and silver nanoparticles (AgNPs) are a research direction that attracts increasing attention from scientists because of their wide and diverse applications in many fields such as medicine, sensors, wastewater treatment and catalysis. In Vietnam, a number of research groups have been developing sensors based on these materials, however, these studies are still very modest.
In particular, the research direction on the application of star-shaped gold nanoparticles (AuNS) in color sensors for iodine compounds is of special interest because iodine is a basic ingredient in food, industrial products and pharmaceuticals; and play important role in enzymatic biochemical reactions in the human body. In addition, iodine is an important indicator for recording radioactive contamination levels in soil and water. Therefore, researching methods to quantify iodine, especially organic iodine, is an urgent issue, bringing many benefits and significance in environmental protection. However, up to now there is still no colorimetric sensor to quantify organic iodine because of the low interaction ability of iodine groups in organic molecules with AuNS.
Organometallic hybrid nanocomposite materials
Hybrid organometallic nanocomposite materials are defined as a combination of two organic components (polymer, organic molecule, ionic liquid, surfactant) and a containing component. Metals (metals, salts) exist in nanometer sizes. The combination of the two materials can help significantly improve physicochemical properties, such as optical, electrical, mechanical properties. Nanocomposite materials based on plasmonic metals can be used for sensors.
To develop technology for manufacturing hybrid organometallic nanocomposite materials, in-depth research is needed on material structure, sensing mechanism, device manufacturing. However, domestic research conditions are still limited, the assessment of the mechanisms on interaction between iodine and AuNS in iodine sensors, has not been done due to the lack of devices to determine the oxidation number of Au and iodine atoms such as XPS. In addition, although chemical methods show advantages in the simplicity of technology, there are still disadvantages, such as the purity, durability and stability of materials lower than physical methods. Therefore, the combination of chemical and physical methods, especially the application of laser technology in manufacturing nanomaterials, is an important solution to overcome this drawback.
Research and technology mastering
With the goal of learning and improving in-depth research capacity, especially using laser technology in the field of manufacturing hybrid organometallic materials from international partners, the research team of Dr. Nguyen Thanh Danh coordinated with the research team of the Institute of Basic Chemical Process Research - Czech Academy of Sciences to carry out the international cooperation task: "Synthesis and application of optical and electrical properties of hybrid nanocomposite materials organometallic generation” (code: QTCZ01.01/22-23).
Within the framework of the research, scientists have successfully synthesized two organometallic hybrid nanosystems: gold nanostars from tween 80 and nanocomposites based on silver nanoparticles from polysaccharides, lactose/alginate. Both nanocomposite systems were synthesized and applied for the first time for chemical sensing and catalysis. The nanocomposite systems have been investigated for their physical and chemical properties through modern analysis. The star-shaped gold nanosystem is applied in quantifying iodine and iodobenzene through the method of changing color and absorption intensity on the UV-Vis spectrum. Meanwhile, silver nanosystems on polysaccharides have been used to sense Fe3+ ions and apply good catalytic efficiency to organic dye reactions.
Dr. Nguyen Thanh Danh said that during the 2 years of performing the task, the research team, especially young staff, had the opportunity to improve their understanding and develop research capacity in the field of laser technology and thin film applications for catalysis and modern methods of energy storage as well as many new technologies. However, Vietnamese scientists have not been able to complete in-depth research on nanocomposite materials, such as the reaction mechanism of star-shaped gold nanosystems and organic iodine. Therefore, he hopes to continue receiving support to develop this research direction in the future.
Some images of exchange activities between the two research groups while performing tasks
Translated by Phuong Huyen
Link to Vietnamese version