Ukrainian Journal of Physical Optics

2023 Volume 24, Issue 4

ISSN 1816-2002 (Online), ISSN 1609-1833 (Print)

Centrifugation-based separation of triangular silver nanoplates from multi-shaped colloidal silver nanoparticles for fabrication of surface-enhanced Raman-scattering substrates

1Phetsahai A., 2Eiamchai P. , 1*Thamaphat K. and 1Limsuwan P.

1Green Synthesis and Application Laboratory, Applied Science and Engineering for Social Solution Research Unit, Department of Physics, Faculty of Science, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand. e-mail:
22 Opto-Electrochemical Sensing Research Team, National Electronics and Computer Technology Center (NECTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand


We synthesize and separate triangular silver nanoplates (TSNPs) from a mixture of colloidal silver nanoparticles of different shapes and sizes, aiming at fabrication of substrates for a surface-enhanced Raman scattering (SERS). The TSNPs are successfully synthesized via a photochemical process involving Ag nanoseeds. This is confirmed by the UV-visible spectroscopy and transmission electron-microscopy analyses. Centrifugation-based separation techniques are employed to isolate the TSNPs and minimize the other nanoparticle morphologies, thus resulting in a good SERS performance. The separated TSNPs manifest a remarkable sensitivity, with the detection limit amounting to 10–12 M in the case of Rhodamine 6G molecules. A linear relationship between the Rhodamine 6G concentration and the Raman-peak intensity demonstrates a great potential of our SERS technique. Hence, our study combines a successful synthesis and separation of the TSNPs with demonstration of their efficient SERS performance. The latter offers new possibilities for the ultrasensitive trace-level detection of substances. These findings contribute to the development of reliable SERS measurements and the advance in the field of nanomaterial-based sensing techniques.

Keywords: triangular silver nanoplates, centrifugation-based separation, surface-enhanced Raman scattering, photochemical synthesis

UDC: 535.375.5+546

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    Ми синтезували та розділили трикутні срібні нанопластини (ТСНП) із суміші колоїдних наночастинок срібла різних форм і розмірів із метою виготовлення підкладок для поверхнево-підсиленого комбінаційного розсіювання (ППКР). ТСНП успішно синтезовано за допомогою фото¬хімічного процесу за участю нанозерен Ag. Це підтверджено методом ультрафіолетової та видимої спектроскопії, а також даними трансмісійної електронної мікроскопії. Методи розділення на основі центрифугування використано для ізоляції ТСНП і мінімізації інших морфологій наночастинок, що забезпечило високу ефективність ППКР. Відокремлені ТСНП виявляють дуже високу чутливість, із межею виявлення, що складає 10–12 М для випадку молекул родаміну 6G. Лінійний зв’язок між концентрацією родаміну 6G та інтенсивністю раманівського піку демонструє значний потенціал нашої методики ППКР. Отже, наше дослідження поєднало успішний синтез і розділення ТСНП із демонстрацією їхньої ефективної ППКР. Останнє пропонує нові можливості для ультрачутливого виявлення слідів речовин. Ці результати сприятимуть розробці надійних вимірювань ППКР і прогресові в галузі методів зондування на основі наноматеріалів

    Ключові слова: трикутні срібні нанопластини, розділення на основі центрифугування, поверхнево-підсилене комбінаційне розсіювання, фотохімічний синтез

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