Absorbance Spectrum Carbon Nanodots (C-Dots) Daun Tembakau

Dewi, Adelina Ryan Candra; Aji, Mahardika Prasetya

doi:10.21009/0305020225

Cited by 7 publications

(8 citation statements)

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“…CNPs adalah material karbon berbentuk morfologi titik-titik dengan sifat yang ringan dan dapat disintesis dari berbagai sumber bahan alami. CNPs dapat disintesis dari daun bambu (Putro & Maddu, 2019), ubi jalar (Shen et al, 2017), susu (Bajpai et al, 2019), limbah industri tebu (Pandiyan et al, 2020), limbah rumah tangga (Himaja et al, 2014), limbah bawang merah (Bandi et al, 2016), daun tembakau (Dewi et al, 2016), dan sabuk kelapa (Chunduri et al, 2016).…”

Section: Pendahuluanunclassified

Analisis Sifat Optik Nano Partikel Karbon Berbahan Daun Pandan Wangi (Pandanus Amaryllifolius) Dengan Metode Sintesis Hidrotermal

Nalwi,

Maddu,

Kurniati

et al. 2023

JoP

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Penelitian ini bertujuan untuk menentukan sifat optik, energi pergeseran Stokes, energi celah pita (Eg), gugus fungsi senyawa kimia dan ukuran karbon nano partikel atau Carbon Nanoparticles (CPNs). Sifat optik terdiri dari absorbansi dan intensitas flouresens yang dihasilkan oleh metode sintesis hidrotermal (150, 160, dan 180) ºC. Panjang gelombang absorbansi dan intensitas flouresens terdeteksi dengan metode spektroskopi UV-Vis (396.31, 399.61, dan 411.24) nm dan eksitasi laser 405 nm untuk emisi flouresens (524.18, 512.04, dan 510.92) nm. Energi pergeseran Stokes diperoleh berdasarkan perbedaan energi foton untuk ekesitasi (absorbansi) dan emisi (flouresen) dengan nilai (0.59, 0.55 dan 0.69) eV. Energi celah pita (Eg) ditentukan dengan mengekstrapolasi grafik ke rentang linier untuk memotong sumbu energi foton. Nilai Eg adalah (2.55, 3.43, dan 2.50) eV. Spektrum dan nilai koefisien ekstensi (k), konduktivitas optik (σopt) meningkat sedangkan indeks bias (n) menurun sering bertambahnya suhu hidrotermal. Spektrum FT-IR dan ukuran CNPs dilakukan dengan menggunakan sampel suhu 180 ºC. Gugus fungsi kimia yang terbentuk adalah C-H, C-N, N=C=S, O=C=O serta senyawa Nitrogen (NO2). Ukuran rata-rata nano partikel karbon adalah 11.09 nm berdasarkan intensitas (%), volume (%) dan nomor (%) partikel pada sampel CNPs.

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Section: Pendahuluanunclassified

Analisis Sifat Optik Nano Partikel Karbon Berbahan Daun Pandan Wangi (Pandanus Amaryllifolius) Dengan Metode Sintesis Hidrotermal

Nalwi,

Maddu,

Kurniati

et al. 2023

JoP

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“…Carbon Dots (CDs) merupakan material karbon dalam bentuk titik (dot) yang memiliki sifat berpendar dan dapat disintesis dari berbagai sumber karbon. CDs dapat disintesis dari bahan dasar daun bambu (Putro & Maddu, 2019), ubi jalar (Shen et al, 2017), susu (Bajpai et al, 2019), limbah industri tebu (Pandiyan et al, 2020), limbah dapur rumah tangga (Himaja et al, 2014), limbah bawang (Bandi et al, 2016), daun tembakau (Dewi et al, 2016) dan sabut kelapa (Chunduri et al, 2016).…”

Section: Pendahuluanunclassified

Karakteristik Sifat Optik Nanopartikel Karbon (Carbon Dots) Dengan Metode Uv-Vis DRS (Ultraviolet-Visible Diffuse Reflectance Spectroscopy)

Jumardin¹,

Maddu²,

Santoso³

et al. 2022

JFT

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Research on the synthesis of Carbon Dots using the laser ablation method has been carried out at a time duration of 1, 2, and 3 hours (energy 60 mJ, wavelength 1064 nm and frequency 10 Hz). This research uses organic material from Tea and Toluene as the carbon solvent. The characterization method uses a UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS) spectrum to measure the reflectance value and uses the Kubelka-Munk equation to determine the relationship between the absorbance coefficient parameter (s) and the scattering reflectance coefficient (k). The size and morphological characterization methods used Particle Size Analyzer (PSA) and Transmission Electron Microscopy, while the functional group characteristics used the Fourier Transform InfraRed (FTIR) tool. FTIR spectra show the O-H group which is a hydroxyl bond and N-H is a carboxylic acid. The results of measurement and analysis of bandgap energy at different time durations for direct transition (n=2) were 1 hour (3.62 eV, 342.49 nm), 2 hours (3.24 eV, 380.61 nm) and 3 hours (2.74, 451.82 nm). Indirect transitions (n=1/2) were 1 hour (3.17 eV, 391.02 nm), 2 hours (2.50 eV, 495.36 nm) and 3 hours (2.21 eV, 559.04).

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“…The usage of learning model can increase learning quality (Dewi, Nugroho & Sulhadi, 2015). 2), improvement of each self-learning aspects are calculated from baseline phase are 46.1% for personal attributes aspects, 52.4% for processes aspects and 10.2% for learning context aspects.…”

Section: The Improvement Of Self-learningmentioning

confidence: 99%

Improving Self-Learning for Deaf Students in SMPLB Through Use of BISINDO Video in Heat and Temperature

Rusilowati

Sulhadi

Purwaningtyas

et al. 2020

JPFI

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Deaf students have limitations on the sense of hearing, so to grow self-learning requires special processes and training. The results of the observations at the especialy needs secondary school (Sekolah menengah pertama luar biasa negeri/SMPLB-N-in Indosesia) found that one of the goals of the SMPLB-N Ungaran was to produce graduates who were independent and could live in community life. This study aims to improve the learning independence of SMPLB-N Ungaran students by using BISINDO-based videos. This video is equipped with sign language that makes it easy for students to understand the material being studied. The method used is an experiment with the design of single subject A-B patterns. A is baseline dan B is Intervention. The data analysis technique uses descriptive percentages. BISINDO-based video-assisted learning helps students improve self-learning. The increase in the learning independence of deaf students from the baseline phase to the intervention phase was 2.29 in the high category. The average increase in studentsâ€™ self-learning is 46.1% for the personal aspects of attributes, 52.4% for the aspect process, and 10.2% for the learning context aspect.

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Absorbance Spectrum Carbon Nanodots (C-Dots) Daun Tembakau

Cited by 7 publications

References 0 publications

Analisis Sifat Optik Nano Partikel Karbon Berbahan Daun Pandan Wangi (Pandanus Amaryllifolius) Dengan Metode Sintesis Hidrotermal

Analisis Sifat Optik Nano Partikel Karbon Berbahan Daun Pandan Wangi (Pandanus Amaryllifolius) Dengan Metode Sintesis Hidrotermal

Karakteristik Sifat Optik Nanopartikel Karbon (Carbon Dots) Dengan Metode Uv-Vis DRS (Ultraviolet-Visible Diffuse Reflectance Spectroscopy)

Improving Self-Learning for Deaf Students in SMPLB Through Use of BISINDO Video in Heat and Temperature

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