SYNTHESIS OF CARBON DOTS (CDS) AND DETERMINATION OF OPTICAL GAP ENERGY WITH TAUC PLOT METHOD

Jumardin Jumardin,Akhiruddin Maddu,Koekoeh Santoso,Isnaeni Isnaeni

doi:10.34312/jpj.v3i2.11235

Jumardin Jumardin, Akhiruddin Maddu + Show 2 more

Open Access

https://doi.org/10.34312/jpj.v3i2.11235

Copy DOI

Abstract

Carbon Dots (CDs) which have been synthesized using the laser ablation method show the presence of UV-Vis absorption in the wavelength range of 303 nm to 333 nm for absorbance and 495 nm to 503 nm for fluorescence. Changes in the time duration 1, 2, 3 hours of CDs resulted in changes in the optical energy gap. The optical energy gap valuesare distinguished by the type of indirect transition (n=2) is 3.40 eV (1 hour), 3.15 eV (2 hour), 2.85 eV (3 hour) and direct transition (n=1/2) is 2.58 eV (1 hour), 2.31 eV (2 hour), 1.70 eV (1 hour).

Highlights

Carbon is a material that is obtained from various sources of organic life so that its development in the field of material engineering is very popular, such as 3-Jumardin et al./ Jambura Physics Journal (2021) Vol 3(2): 73-86 dimensional graphite (Belenkov & Ali-Pasha, 2011), 2-dimensional graphene and graphene oxide (Klintenberg et al, 2009), 1-dimensional carbon nanotubes, to carbon nanomaterials (Ahmadi et al, 2008)
The optical properties of Carbon Dots (CDs) based on experimental observations of UV Vis spectro photometer and fluorescence can be seen in table 1
The three wavelength peaks of CDs show that the edge of the absorption band shifts to the longer wavelength region so that electrons are excited from the valence energy to the conduction spectrum

Summary

Introduction

Carbon is a material that is obtained from various sources of organic life so that its development in the field of material engineering is very popular, such as 3-Jumardin et al./ Jambura Physics Journal (2021) Vol 3(2): 73-86 dimensional graphite (Belenkov & Ali-Pasha, 2011), 2-dimensional graphene and graphene oxide (Klintenberg et al, 2009), 1-dimensional carbon nanotubes, to carbon nanomaterials (Ahmadi et al, 2008). In contrast to carbon nanodots (CDs) they contain carboxylic acids on their surface and can cause higher solubility in water so that they can be functionalized against organic, polymeric, inorganic, and biological materials (Baker et al, 2010). Fundamental research and applications of carbon-based materials have always been popular in chemistry, materials, and other interdisciplinary fields. CDs present interesting fluorescent properties (Liu et al, 2016), low toxicity (Wang et al, 2013), good water solubility (Bhatt et al, 2020), good biocompatibility (Emam et al, 2017), has many types of functional groups such as amino, hydroxyl and carboxyl compounds (Ding et al, 2020), high stability (Basu et al, 2015) and electron mobility (Zhang et al, 2018). Very small CDs with large surface-to-volume ratios are expected to improve their performance in sensing (Sun et al, 2017) and catalytic applications (Hutton et al, 2017)

Methods

Findings

Discussion

Conclusion