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Highly sensitive silver nanorod arrays for rapid surface enhanced Raman scattering detection of acetamiprid pesticides
Caiqin Han
Author NameAffiliationE-mail
Caiqin Han Jiangsu Normal University hancq@jsnu.edu.cn 
Abstract:
The determination of pesticide residue on agricultural products is increasingly important, due to which can cause severe acute reactions in humans, including aplastic anemia and leukemia. In this work, we developed a rapid method for highly sensitive detection of acetamiprid pesticide residue based on surface-enhanced Raman scattering (SERS). Silver nanorod (AgNR) arrays were fabricated by oblique angle deposition technology and used as SERS substrates after a cleaning process with nitric acid solution or a mixture of methanol and acetone. The result shows that the Raman enhancement ability of AgNR array can be improved 1000 times compared to an unwashed substrate due to the effective removal of the impurities on AgNRs surface when cleaned by methanol and acetone. The limit of detection (LOD) of acetamiprid was determined to be 0.1 mg/L. In addition, the molecular structure of acetamiprid was optimized and the corresponding vibration modes of the characteristic bands of acetamiprid were calculated by density function theory. Furthermore, the AgNRs array substrates were applied to the rapid identification of acetamiprid residue on a cucumber’s surface, confirming the possibility of utilizing the AgNRs SERS substrates as a new method for highly sensitive pesticide residue detection.
Key words:  surface-enhanced Raman spectroscopy, acetamiprid, silver nanorod array, substrate cleaning
FundProject:
Highly sensitive silver nanorod arrays for rapid surface enhanced Raman scattering detection of acetamiprid pesticides
Han
摘要:
The determination of pesticide residue on agricultural products is increasingly important, due to which can cause severe acute reactions in humans, including aplastic anemia and leukemia. In this work, we developed a rapid method for highly sensitive detection of acetamiprid pesticide residue based on surface-enhanced Raman scattering (SERS). Silver nanorod (AgNR) arrays were fabricated by oblique angle deposition technology and used as SERS substrates after a cleaning process with nitric acid solution or a mixture of methanol and acetone. The result shows that the Raman enhancement ability of AgNR array can be improved 1000 times compared to an unwashed substrate due to the effective removal of the impurities on AgNRs surface when cleaned by methanol and acetone. The limit of detection (LOD) of acetamiprid was determined to be 0.1 mg/L. In addition, the molecular structure of acetamiprid was optimized and the corresponding vibration modes of the characteristic bands of acetamiprid were calculated by density function theory. Furthermore, the AgNRs array substrates were applied to the rapid identification of acetamiprid residue on a cucumber’s surface, confirming the possibility of utilizing the AgNRs SERS substrates as a new method for highly sensitive pesticide residue detection.
关键词:  surface-enhanced Raman spectroscopy, acetamiprid, silver nanorod array, substrate cleaning
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