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All Journal Jurnal Spektra Journal of Physics and Its Applications
Nursidik Yulianto, Nursidik
Pusat Penelitian Fisika, Lembaga Ilmu Pengetahuan Indonesia, Gedung 442 Puspiptek, Tangerang Selatan, 15314
Astronomy Earth & Planetary Sciences Materials Science & Nanotechnology Physics

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PENGARUH NANOPARTIKEL EMAS TERHADAP PENINGKATAN EMISI CAHAYA KUANTUM DOT Isnaeni, -; Yulianto, Nursidik
Jurnal Spektra Vol 16, No 3 (2015): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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Abstract

AbstrakTelah dilakukan penelitian terhadap peningkatan emisi kuantum dot dengan lapisan silika sebesar 90% akibat pengaruh nanopartikel emas. Dalam penelitian ini, kami menggunakan kuantum dot komersial yang memiliki panjang gelombang emisi pada 560 nm. Pelapisan silika pada kuantum dot dilakukan dengan teknik emulsi mikro. Tebal lapisan silika sekitar 10 nm, digunakan sebagai pengisi jarak antara kuantum dot dengan nanopartikel emas. Struktur hidrid kuantum dot dan nanopartikel emas dibuat dengan menggunakan interaksi ionik. Dari gambar SEM kami menemukan bahwa nanopartikel emas tersebar merata dipermukaan kuantum dot yang telah dilapisi oleh silika. Pengukuran emisi kuantum dot dilakukan dengan teknik fotoluminesensi mikro sehingga emisi dari setiap kuantum dot dapat terdeteksi. Dari hasil pengujian didapatkan peningkatan emisi kuantum dot dipengaruhi oleh konsentrasi nanopartikel emas disekitar kuantum dot dan konsentrasi kuantum dot dalam lapisan silika. Kami juga mengamati bahwa pelapisan silika dapat mengurangi efisiensi kuantum dari kuantum dot, namun struktur hibrid kuantum dot dan nanopartikel emas dapat digunakan untuk aplikasi seperti lampu LED.Kata kunci: kuantum dot, nanopartikel emas, pelapisan silika, fotoluminesensi AbstractWe have observed an enhancement of silica-coated quantum dots emission by 90 % due to the present of gold nanoparticles. In this work, we used commercial toluene soluble CdSe/ZnS quantum dots that has emission peak wavelength at 560 nm. The coating of silica was done using reversed micro emulsion method. The thickness of silica, which was about 10 nm, is acting as spacer between quantum dots and gold nanoparticles. The conjugation of gold nanoparticles and silica-coated quantum dots was done using ionic interaction. From SEM image, we found that gold nanoparticles were situating at the surface of silica-coated quantum dots. The measurement of quantum dots emission was done using micro photoluminescence, so that individual silica-coated quantum dots sphere can be monitored. Furthermore, the enhancement depends not only on gold nanoparticles concentration surrounding the quantum dots, but also quantum dot concentration inside silica spheres. However, we noticed that silica coating process has reduced quantum yield of quantum dots. This conjugation structure is useful for optical devices application such as light emitting diodes.Keywords: quantum dot, gold nanoparticles, silica encapsulation, photoluminecence 
Optical Response of Various Heavy Metal Ions-Based Carbon Dots Photoluminescent Quenching Effect Sugiarto, Iyon Titok; Yulianto, Nursidik; Tresna, Wildan Panji; Lewa, Ismira Wahyu Lestari; Isnaeni, Isnaeni
Journal of Physics and Its Applications Vol 6, No 1 (2023): November 2023
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v6i1.18755

Abstract

Carbon nanodots (Cdots) are a type of semiconductor carbon-based nanomaterial that is gaining popularity due to its excellent characteristics (e.g., biocompatibility, unique optical properties, low cost, eco-friendly, and high stability). In terms of physicochemical properties for an environmentally friendly sensor application, this material also has an excellent ability to detect heavy metal ions in the biosphere. In this study, we proposed a comprehensive optical characterization to examine the sensitivity of the Cdots probe for three heavy metal ions (i.e., Mn, Pb, and Cr ions) and compare the performance. The results of the experiment revealed that each heavy metal ion reacted differently to the physical properties of Cdots. With the addition of Cr, Mn, and Pb metal ions from the original Cdot solution, which is only 1.45 ns, the lifetime of quenched Cdots is 2.55 ns, 3.15 ns, and 2.15 ns, respectively, according to the TRPL experiments. With additional Cr, Mn, and Pb discovered, the intensity of PL dropped by 5.7%, 14.2%, and 21.4%, respectively. Among these various heavy metal ions, Pb ions show the most affected by the quenching effect in Cdots-based photoluminescence, FTIR, and ultraviolet-visible light absorption characterization. Based on the results of three heavy metal ion experiments, this study can be implemented as the heavy metal ion sensor-based luminescence quenching effect of Cdots.
Co-Authors - Isnaeni, - Isnaeni Isnaeni Lewa, Ismira Wahyu Lestari Sugiarto, Iyon Titok Wildan Panji Tresna