Study on the fabrication of SERS (surface-enhanced Raman scattering) substrates in form of silver nanodendrites and silver nanoflowers on silicon to detect pesticide residues

Project leader's name
Luong Truc Quynh Ngan, Dr.
Research hosting institution
Institute of Materials Sciences
Project duration
2017 - 2018
́Project’s budget
500.000.000 VND.
Classify
Excellent
Goal and objectives of the project

Fabrication of silver nanomaterials with complex structures such as silver nanodendrites (AgNDs) or silver nanoflowers (AgNFs), ... on silicon (Si) by chemical deposition methods and electrochemical deposition then uses these substrates to detect the traces of pyridaben pesticides using surface-enhanced Raman scattering (SERS) technique. The pesticide (pyridaben) detection limit that this project intended to reach is 0.1 ppm.

Main results

- Theoretical results:
+ Successfully fabricated of SERS substrates in the form of AgNDs on Si using chemical deposition and electrochemical deposition and investigating the effect of fabrication conditions on the morphological structure of AgNDs from which we can be found fabrication conditions to obtain the AgNDs with optimal structure for SERS applications.
+ Successfully fabricated of SERS substrates in the form of AgNFs on Si using chemical deposition and investigating the effect of fabrication conditions on the morphological structure of AgNFs from which we can be found fabrication conditions to obtain the AgNFs with optimal structure for SERS applications.

- Applied results:
+ Successfully used two types of SERS substrates such as AgNDs@Si and AgNF@Si to detect trace amounts of pesticides pyridaben and found that both of these substrates meet well for pyridaben analysis in the state purity (with detection limit of 0.011 ppm for AgNDs@Si substrates and 0.014ppm for AgNFs@Si substrates) as well as in Koben 15EC commercial pesticide (can be detected at a concentration lower than 0, 1 ppm).

Some images of the project: 

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Novelty and actuality and scientific meaningfulness of the results

Successfully fabricated silver nanodendrites and silver nanoflowers on Si using chemical deposition and electrochemical deposition with controllable structure and found the optimal structure for SERS application. These SERS substrates can detect pyridaben pesticides with concentrations below 0.1 ppm.

Products of the project

- Scientific papers in referred journals (list):

  1. Luong Truc Quynh Ngan, Kieu Ngoc Minh, Dao Tran Cao, Cao Tuan Anh and Le Van Vu, Journal of Electronic Materials, 2017, Vol. 46, 3770-3775.
  2. Kieu Ngoc Minh, Cao Tuan Anh, Luong Truc Quynh Ngan and Le Van Vu and Dao Tran Cao, Communications in Physics, 2016, Vol. 26, No. 3, 241-246. (Xuất bản năm 2017)
  3. Cao Tuấn Anh, Hoàng Thị Thu Hải, Kiều Ngọc Minh, Lương Trúc Quỳnh Ngân, Đào Trần Cao, Lê Văn Vũ, Vũ Mạnh Hùng, Trịnh Phi Hiệp, Nguyễn Lê Phương, Tạp chí Phân tích Hóa, Lý và Sinh học, 2018,Tập 23, Trang 338.
  4. Dao Tran Cao, Kieu Ngoc Minh, Cao Tuan Anh, Luong Truc Quynh Ngan, Nguyen Ngoc Hai, and Le Van Vu (2017), “Synthesis and use of silver microflowers for dectecting traces of cyanide by surface-enhanced Raman spectroscopy”, Proceedings of IWNA 2017, 08-11 November 2017, Phan Thiet, Vietnam, 551-554.

- Technological products (describe in details: technical characteristics, place):
10 SERS substrates with dimensions of 0.6 x 0.6 cm2 include: 05 SERS substrates in form of silver nanodendrites on Si that fabricated by electrochemical deposition method and 05 SERS substrates in form of silver nanoflowers on Si that fabricated by chemical deposition method. These SERS substrates can detect pyridaben pesticides with concentrations lower than 0.1 ppm. These substrates are stored in sealed boxes of 1.5x1.5 cm2 in size, at room temperature and are currently located in the laboratory of the project group (Room 317 - Institute of Materials Science , 18 Hoang Quoc Viet, Cau Giay, Hanoi).

- Other products (if applicable):
+ Processes: The project product consists of 01 process of fabrication of SERS substrates in form of silver nanodendrites and nanoflowers on Si with SEM, and XRD images. Detailed content of the process is presented in the appendix of the report.
+ Training results: The results of the research will be part of the doctoral thesis of Kieu Ngoc Minh.

Recommendations

to be assigned to perform one project more on the SERS topic.

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