Sintesis dan Karakterisasi Optik N-doped dan N, B/P Co-doped Carbon Dots

Solihin, Solihin (2024) Sintesis dan Karakterisasi Optik N-doped dan N, B/P Co-doped Carbon Dots. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Carbon dots (CDs) merupakan material skala nano yang memiliki karakteristik optik menarik dan potensi aplikasi yang besar. Peningkatan karakteristik carbon dots melalui doping perlu mempertimbangkan toksisitas bahan, kemudahan akses, biaya, dan tingkat keberhasilan dalam sintesisnya. Sehingga perlu adanya penelitian untuk membahas beberapa doping yang sangat potensial terutama untuk meningkatkan sifat optik CDs. Pada penelitian ini, doping nitrogen serta co-doping nitrogen-boron dan nitrogen-fosfor dilakukan pada material CDs untuk mengetahui efeknya terhadap karakteristik optik CDs yaitu efek fotoluminesensi dan absorbsi optik. Sintesis dilakukan dengan metode iradiasi microwave komersial menggunakan prekursor citric acid serta bahan dopan carbonyl diamide, boric acid, dan phosphoric acid. Proses sintesis menghasilkan sampel nitrogen-doped carbon dots (N-CDs) dari prekursor citric acid dan carbonyl diamide, nitrogen-boron co-doped carbon dots (N-B-CDs) dari prekursor citric acid, carbonyl diamide, dan boric acid, serta nitrogen-fosfor co-doped carbon dots (N-P-CDs) dari prekursor citric acid, carbonyl diamide, dan phosphoric acid. Sampel dikarakterisasi dengan Ultraviolet-Visible Spectroscopy, Photoluminescence Spectroscopy, Particle Size Analyzer, dan Fourier-Transform Infrared Spectroscopy. Sampel hasil sintesis memiliki ukuran ±0,65 nm sehingga telah dipengaruhi oleh efek pengurungan kuantum. Modifikasi permukaan dan efek pengurungan kuantum memengaruhi energi celah pita material. Kemudian energi celah pita material memengaruhi puncak fotoluminesensi. Posisi puncak fotoluminesensi berada pada rentang 502-504 nm. Penambahan carbonyl diamide dalam proses doping mampu meningkatkan efek fotoluminesensi sampel dengan signifikan. Adapun penambahan boric acid atau phosphoric acid bersama nitrogen dapat meningkatkan energi celah pita material. Selain itu, penambahan boric acid sebagai co-doping juga dapat memperluas wilayah absorbansi material. Sedangkan penambahan phosphoric acid sebagai co-doping pada sampel dengan 0,1 gram carbonyl diamide dapat menggeser puncak fotoluminesensi secara signifikan ke arah panjang gelombang yang lebih pendek (blue shift).
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Carbon dots (CDs) represent nano-scale materials endowed with intriguing optical characteristics and considerable potential for diverse applications. The augmentation of CD properties through doping necessitates meticulous consideration of material toxicity, accessibility, cost, and synthesis success rates. Consequently, it is imperative to conduct research to elucidate the efficacy of various dopants, with a particular focus on enhancing the optical features of CDs. In the present investigation, nitrogen doping, as well as nitrogen-boron and nitrogen-phosphorus co-doping, were systematically applied to CD materials to scrutinize their impact on optical characteristics, specifically pertaining to photoluminescence and optical absorption effects. The synthesis was executed utilizing a commercial microwave irradiation method, employing citric acid as the precursor, and introducing doping agents, namely carbonyl diamide, boric acid, and phosphoric acid. The synthetic process yielded nitrogen-doped carbon dots (N-CDs) derived from citric acid and carbonyl diamide precursors, nitrogen-boron co-doped carbon dots (N-B-CDs) derived from citric acid, carbonyl diamide, and boric acid, alongside nitrogen-phosphorus co-doped carbon dots (N-P-CDs) derived from citric acid, carbonyl diamide, and phosphoric acid precursors. The synthesized samples underwent comprehensive characterization using Ultraviolet-Visible Spectroscopy, Photoluminescence Spectroscopy, Particle Size Analyzer, and Fourier-Transform Infrared Spectroscopy. The resultant samples exhibited a size of approximately ±0.65 nm, indicative of quantum confinement effects. Surface modification and quantum confinement effects exerted a discernible influence on the material's bandgap energy, thereby influencing the observed photoluminescence peak at 502-504 nm. Notably, the introduction of carbonyl diamide during the doping process demonstrated a significant augmentation of the photoluminescence effect in the samples. Furthermore, co-doping with boric acid or phosphoric acid, in conjunction with nitrogen, led to an elevation in the material's bandgap energy. Noteworthy was the expanded absorption region observed when boric acid served as a co-doping agent. Conversely, the addition of phosphoric acid as a co-doping agent in samples with 0.1 grams of carbonyl diamide induced a pronounced blue shift in the photoluminescence peak towards shorter wavelengths.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Carbon Dots, Efek Fotoluminesensi, Energi Celah Pita, Band Gap Energy, Photoluminescence Effect
Subjects:	Q Science > QC Physics > QC162 Adsorption and absorption Q Science > QC Physics > QC451 Spectroscopy Q Science > QC Physics > QC475 Photoluminescence Q Science > QD Chemistry > QD96F56 Fluorescence spectroscopy
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Solihin Solihin
Date Deposited:	04 Feb 2024 15:31
Last Modified:	04 Feb 2024 15:31
URI:	http://repository.its.ac.id/id/eprint/106015

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