Kajian terhadap sifat optik titik kuantum kadmium sulfida pada pelbagai nilai pH dan modifikasi permukaan dengan asid tioglikolik

Translated title of the contribution: Study on optical properties of cadmium sulphide quantum dots in various pH values and surface modification by thioglycolic acid

Siti Aisyah Shamsudin, Jenniver Junas

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Traditional imaging has many drawbacks such as a short lifetime and larger particles’sizes as the result the fluorescence property does not long lasting due to the photo-bleaching phenomenon. Via this study, nanocrystal cadmium sulphide has been synthesized and functioned as a quantum dot imaging corresponding to optical properties that vary with particle size. Optical properties of the quantum dots of cadmium sulphide (CdS QDs) can be changed by particles’ size and also of the chemical composition while synthesis such as pH values. In this study, the optical properties of CdS QDs were studied against the change in the pH values by preparing CdS QDs via the colloidal method. Cadmium acetate dehydrated (C4H6CdO4.2H2O) and sodium sulphide (Na2S) are used as the precursors for producing CdS QDs. The pH values are modified by titrating sodium hydroxide (NaOH) into CdS QDs’ aqueous solution. Five pH values of aqueous solutions at pH5, pH7, pH8, pH9 and pH10 were prepared however, agglomeration often occurs during the synthesising process. Therefore, thioglycolic acid (HSCH2CO2H) was used as a stabilizer agent for CdS QDs. UV-vis Spectra have shown blue-shifted when CdS QDs on the alkaline medium due to the nanocrystals’ sizes are decreased. The result from fluorescence spectroscopy has given the CdS QDs in pH8 gives the highest peak compared to others pH values. This happened because at this pH value, the nanocrystalline is able to change to the right position and formed the CdS QDs with high crystallization. Thus, this mechanisms of the occurrence of the trap hole obtained and caused the exciton.

Original languageMalay
Pages (from-to)2841-2849
Number of pages9
JournalSains Malaysiana
Volume47
Issue number11
DOIs
Publication statusPublished - 1 Nov 2018

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Semiconductor quantum dots
Surface treatment
Optical properties
Nanocrystals
Particle size
Hole traps
Imaging techniques
Stabilizers (agents)
Photobleaching
Sodium Hydroxide
Fluorescence spectroscopy
Crystallization
Agglomeration
Fluorescence
Chemical analysis
cadmium sulfide
2-mercaptoacetate
sodium sulfide
cadmium acetate
LDS 751

ASJC Scopus subject areas

  • General

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Kajian terhadap sifat optik titik kuantum kadmium sulfida pada pelbagai nilai pH dan modifikasi permukaan dengan asid tioglikolik. / Shamsudin, Siti Aisyah; Junas, Jenniver.

In: Sains Malaysiana, Vol. 47, No. 11, 01.11.2018, p. 2841-2849.

Research output: Contribution to journalArticle

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