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Page 65

May 16-17, 2019 | Prague, Czech Republic

International Conference on

Nanomaterials and Nanotechnology

Advanced Nanoscience and Nanotechnology

Joint Event

Journal of Materials Science and Nanotechnology | Volume 3

Mater Sci Nanotechnol, Volume 3

Prometryn and atrazine herbicide detection via SERS using silver nanoparticles

functionalized with humic substance

Rafael J G Rubira, Carlos J L Constantino

and

Santiago Sanchez-Cortes

University Estadual Paulista, Brazil

he growing demand for food and the increase world

population have led to the need of large cultivable areas

and increased the productivity in agriculture, which resulted

in the increased use of pesticides, especially in Brazil where

the tropical weather (hot and humid) contributes to the

proliferationofpestsandweeds.Theuncontrolleduseofthese

chemical compounds causes damage to the environment,

contaminating vegetables, soil, groundwater and other

fountains. This contamination may cause health problems

for those who come in contact with the contaminant agents

andmay harm the areas where the pesticides were used even

in the case of more distant areas, due to their permanence

in the environment. The functionalization of metal NPs

leads to the modification of the chemical properties of the

surface that further potentiate the performance of plasmonic

devices. Functionalization of surfaces is an important process

in the analytical applications of SERS due to the large increase

of the affinity of many pollutants toward the metal surface is

highly affected by the nature of the metal interface. Humic

substances are interesting natural macromolecules which

can be employed in the functionalization of NPs due to two

main factors: a) they can be easily adsorbed onto the metal

surface, and b) they can link a large list of pollutants existing in

the environment. Among these pollutants we find polycyclic

aromatic hydrocarbons (PAHs), and pesticides. In this work

we report the functionalization of AgNPs with the shape of

nanospheres with standard humic substances (HS) extracted

fromsoils. These substrates were employed to detect atrazine

and prometryn, two of the most used triazine pesticides used

in agricultural practices in order to increase the sensitivity and

selectivity of the SERS analysis.