Surface passivated aqueous mediated synthesis of CdTe QDs: potential nano thin films

Baruah, Jejiron Maheswari; Narayan, Jyoti

doi:10.1088/2053-1591/ab31c4

Cited by 6 publications

(3 citation statements)

References 34 publications

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“…Cadmium telluride (CdTe) is a semiconductor formed in the form of QDs nanomaterial according to the preparation method. It has a direct energy gap of about 1.53 eV, making it widely used in many applications such as solar cells, biological sensors, and other applications [9][10][11]. Recently, many studies have reported the different methods used to prepare CdTe such as the aqueous method using microwave irradiation [12], and the ultrasonic thermal synthesis [13].…”

Section: Issn: 0067-2904mentioning

confidence: 99%

Study of the Effect of pH on the Optical Properties of the CdTe Quantum Dots

Noori

Abdulameer²

2023

Iraqi Journal of Science

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This research aims to study the effect of different pH values on the growth of CdTe nanoparticles during specific times. The reflux method has been used as a method for preparing CdTe quantum dots. A difference in absorbance and intensities of peaks at pH 10.5 and 11.5 was observed during the reaction period. The growth rate of the NPs (nucleation) was irregular at low pH values. Optical examinations showed that the best growth rate of NPs was at pH value 12.

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Section: Issn: 0067-2904mentioning

confidence: 99%

Study of the Effect of pH on the Optical Properties of the CdTe Quantum Dots

Noori

Abdulameer²

2023

Iraqi Journal of Science

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“…Cadmium telluride (CdTe) and cadmium selenide (CdSe) are members of the II-VI group, which have been employed in various fields with the progress of scientific development in recent years due to their different properties from CdSe and CdTe bulk [8]. Cadmium telluride (CdTe) is direct-gap, of approximately 1.53 eV, semiconductor [9]. Cadmium-selenium (CdSe) is one of the most popular in semiconductors applications, with a direct energy gap of about 1.74 eV [10].…”

Section: Introductionmentioning

confidence: 99%

Study the Structure Properties of CdTe and CdTe/CdSe Quantum Dots at pH=12 using an Aqueous Method

Noori,

Abdulameer

2024

Iraqi Journal of Science

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This research aims to study the structural properties of cadmium telluride (CdTe) core QDs and cadmium telluride/ cadmium selenium (CdTe/CdSe) core-shell QDs at pH 12. The QDs were prepared using aqueous synthesis by reflux process. The structural properties of the QDs were studied using X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray spectroscopy (EDX), and Transmission Electron Microscopy (TEM). The results of the XRD analysis for CdTe QDs and CdTe/CdSe QDs showed that they have three diffraction peaks in the directions (111), (220), and (331) with a slight shift in the diffraction peaks of CdTe/CdSe QDs, which indicates the successful packing of selenium atoms around CdTe. FESEM results confirmed that CdTe and CdTe/CdSe QDs possess quantum spherical NPs with diameters ranging from 27 nm to 41 nm. The EDX results confirm corrections of added concentrations The histogram images of the TEM analysis show that the diameters of CdTe and CdTe/CdSe are 7nm and 9 nm, respectively.

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“…Cadmium telluride (CdTe) is a semiconducting nanomaterial with a direct energy gap of approximately 1.53 eV. It is a good candidate for many applications, such as biological sensors, solar cells, and other applications [19][20][21]. On the other hand, Cadmium-selenium CdSe is one of the most widely used semiconductors with a direct energy gap of approximately 1.74 eV [22].…”

Section: Introductionmentioning

confidence: 99%

Study of the Optical Properties of 3MPA CdTe and 3MPA CdTe/CdSe Quantum Dots at PH 12 in Different Periods of Time

Noori,

Abdulameer

2023

IJP

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This research aims to study the optical characteristics of semiconductor quantum dots (QDs) composed of CdTe and CdTe/CdSe core-shell structures. It utilizes the refluxed method to synthesize these nanoscale particles and aims to comprehend the growth process by monitoring their optical properties over varied periods of time and pH 12. Specifically, the optical evolution of these QDs is evaluated using photoluminescence (PL) and ultraviolet (UV) spectroscopy. For CdTe QDs, a consistent absorbance and peak intensity increase were observed across the spectrum over time. Conversely, CdTe/CdSe QDs displayed distinctive absorbance and peak intensity variations. These disparities might stem from irregularities in forming selenium (Se) layers around CdTe QDs during growth stages, which could potentially induce quenching in the emission spectrum. The optical examinations unveiled a discernible redshift towards higher wavelength values as the reaction progressed. This spectral shift was coupled with an enlargement in QDs size and a decrease in the energy gap. Using PL and UV analysis techniques enabled a comprehensive study of the optical attributes of the CdTe and CdTe/CdSe QD systems. Our findings underscored the influence of growth conditions and shell materials on the optical properties of QDs. The observed changes in absorbance, peak intensity, wavelength values, QDs size, and energy gap with increasing reaction time provided valuable insights into the growth dynamics of these QD structures.

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Surface passivated aqueous mediated synthesis of CdTe QDs: potential nano thin films

Cited by 6 publications

References 34 publications

Study of the Effect of pH on the Optical Properties of the CdTe Quantum Dots

Study of the Effect of pH on the Optical Properties of the CdTe Quantum Dots

Study the Structure Properties of CdTe and CdTe/CdSe Quantum Dots at pH=12 using an Aqueous Method

Study of the Optical Properties of 3MPA CdTe and 3MPA CdTe/CdSe Quantum Dots at PH 12 in Different Periods of Time

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