Effect of Ni doping on the structural, optical and morphological properties of CdSe QDs by chemical precipitation method

Thirugnanam, N.; Govindarajan, D.

doi:10.1007/s10854-016-4333-8

Cited by 11 publications

(3 citation statements)

References 25 publications

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“…In general, the IR peak recorded in the range below 700 cm −1 indicates the metal-metal vibrations. [45][46][47][48][49][50] Thus, the observed bands at 445 cm −1 and 553 cm −1 are attributed to Cd-Se vibration. 45,46 The IR spectrum of nanocomposites (Fig.…”

Section: Resultsmentioning

confidence: 99%

Sensitive Detection of Aqueous Methanol by Electrochemical Route Using Mesoporous α-Fe₂O₃ Doped CdSe Nanostructures Modified Glassy Carbon Electrode

Abdullah

Faisal

Ahmed

et al. 2021

J. Electrochem. Soc.

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The proper coupling of different semiconductor nanostructures is a promising strategy to enhance the electrocatalytic activity for better performance of chemical sensor-based electrodes. Herein, we demonstrate the successful combination of mesoporous iron oxide (α-Fe2O3) doped cadmium selenide (CdSe) semiconducting nanocomposite for the sensitive detection of liquid methanol by the electrochemical technique. The active nanocomposite was synthesized by a facile modified sol-gel method in the presence of Pluronic F127 as a structure-directing agent, followed by a simple sono-chemical procedure. The structural, elemental, and morphological features of the as-synthesized α-Fe2O3/CdSe nanocomposite were fully characterized using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), Fourier transforms infrared (FTIR), and Raman spectroscopy, which confirmed the purity, crystallinity and nanoscale dimension of synthesized materials. Compared to bare glassy carbon electrode (GCE) or CdSe modified GCE, the newly developed nanocomposite modified GCE with structure (α-Fe2O3−CdSe/Nafion/GCE) was found to be superior in methanol sensing. Outstanding sensor sensitivity of 0.2744 μAmM−1 cm−2, low limit of detection (LOD) at (S/N = 3) = 0.041 ± 0.005 mM and a wide dynamic range from 0.2 up to 800 mM have been obtained. The current electrode system exhibited also good operational stability, reproducibility, and repeatability during methanol sensing. The current research findings indicate the possible potential application of current nanocomposite as an efficient electrochemical sensor for other target analytes.

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Section: Resultsmentioning

confidence: 99%

Sensitive Detection of Aqueous Methanol by Electrochemical Route Using Mesoporous α-Fe₂O₃ Doped CdSe Nanostructures Modified Glassy Carbon Electrode

Abdullah

Faisal

Ahmed

et al. 2021

J. Electrochem. Soc.

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“…Our results were consistent with previous reports on the bandgap activities during doping of Ni, which were discussed in Wu and Yan (2013), Thirugnanam and Govindarajan (2016), and Sabir et al (2018). [7,36,37] We used time-resolved photoluminescence (TRPL) to further study the PL properties of undoped QD 650…”

Section: Qd 650mentioning

confidence: 99%

Biocompatible Ni‐doped CdSe/ZnS semiconductor nanocrystals for cellular imaging and sorting

et al. 2022

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Quantum dots (QD) with chemical composition QD 650CdSe=ZnS_Ni were successfully synthesized using a hydrothermal method and chemical precipitation. The nanocrystalline phase of the nanostructures was isolated and characterized using X-ray diffraction (XRD). The mean crystalline size doped core/shell Ni-dopant range was 9.0 ± 2.0 nm. The ferromagnetic data revealed the magnetic behaviour of QD 650CdSe=ZnS_Ni . The optical absorption measurements of these QDs were in the UV-visible light range 200-800 nm for a band gap value of 2.11 eV for QD 650 CdSe=ZnS_Ni . This means that pure QD 650CdSe and QD 650 CdSe=ZnS_Ni underwent a redshift when compared with bulk CdSe. For QD 650CdSe=ZnS_Ni there was successful uptake by cell lines including HeLa and MCF-7 for bioimaging and sorting applications.

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“…Some dopants were reported to reduce the particle size of some materials, which have been produced by chemical methods. [26][27][28] In particular, aluminum (Al) as a trivalent dopant was recently found to reduce the size of CuO nanosheets and simultaneously enhanced the electrical conductivity of a compact of CuO nanosheets. [26] In the present work, undoped and Al-doped CuI NPs were synthesized by the costeffective chemical precipitation method, and it was found that Al-doping significantly reduced the particle size and simultaneously enhanced the electrical conductivity of a sintered compact of NPs with an appropriate Al concentration.…”

Section: Introductionmentioning

confidence: 99%

Structural Modifications and Enhanced Thermoelectric Performance of CuI Nanoparticles Induced via Al‐Doping

Salah

Alshahrie

Aljaghtham

et al. 2022

Adv Elect Materials

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highly efficient TE materials that possess a high electrical conductivity (σ), large Seebeck coefficient (S), and low thermal conductivity (κ) is very important. The values of these TE properties are ultimately affecting the value of the dimensionless parameter figure of merit ZT, which evaluates the efficiency of TE materials, and it is expressed as S 2 σT/κ, where T is the absolute temperature. [1] In the last 7-8 decades many materials have been developed and tested for the TE efficiency. In the 1950s, Bi 2 Te 3 was emerged as a promising inorganic TE material, [2] n-type Bi 2 Te 3-x Se x and p-type Bi 2-x Sb x Te 3 [3] were further found to show higher TE performance. Since then, a wide variety of materials, such as oxides, sulfides, silicides, selenides, skutterudites, intermetallic compounds, organic polymers, etc., have been proposed and investigated for TE applications. [4][5][6][7][8][9] Nanocarbon materials and their composites are also studied extensively in recent years. [10][11][12] Most of these materials, however, still demonstrate low TE efficiency at low temperature range of 200-400 K.A limited number of TE materials such as Cu 2 Se, [13] Ag 2 Se, [14] Bi 2 Te 3 nanostructures, [15,16] and Bi 0.5 Sb 1.5 Te 3 /PEDOT:PSS composite, [17] have been developed to be used near the room temperature (RT). Another work was also continued to develop TE materials with high ZT such as Mg 3 Sb 2 -based, which exhibits ZT near 1. [18] Although, these efforts were performed mainly for developing TE materials at RT, evolving more TE materials at RT are still in the early stages. Many reports have recently identified that copper iodide (CuI) is a promising material, which demonstrates good TE performance near RT. [19][20][21][22][23][24] The gamma phase (zinc blende structure) of CuI (denoted as γ-CuI) has a wide band gap (3.1 eV) with electron holes as charge carriers and it is classified as a flexible transparent p-type semiconductor. CuI is an environmentally friendly material due to its nontoxicity and naturally abundant elements, id est copper and iodine. In this material, iodine is a heavy element which leads to reduce the thermal conductivity and therefore enhances TE efficiency. The γ-CuI has been investigated for several applications, such as transparent electrode for solar cells, RT blue-emitting devices, vacuum fluorescent, and field emission displays. [19] Many researches have produced CuI in different forms including nanoparticles (NPs) and evaluated them for TE applications. [19][20][21][22][23][24] Recently, the effect of doping CuI NPs with several activators to enhance the TE performance has been reported. Some of the activators such as terbium (Tb) and iron (Fe) Thermoelectric (TE) materials are of great importance for harvesting thermal energy from waste or solar heat. One of the promising TE materials is copper iodide (CuI), which is nontoxic, earth-abundant, and has a high Seebeck coefficient at room temperature (RT). The TE performance of CuI nanoparticles (NPs) is found to be further enhance...

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Effect of Ni doping on the structural, optical and morphological properties of CdSe QDs by chemical precipitation method

Cited by 11 publications

References 25 publications

Sensitive Detection of Aqueous Methanol by Electrochemical Route Using Mesoporous α-Fe₂O₃ Doped CdSe Nanostructures Modified Glassy Carbon Electrode

Sensitive Detection of Aqueous Methanol by Electrochemical Route Using Mesoporous α-Fe₂O₃ Doped CdSe Nanostructures Modified Glassy Carbon Electrode

Biocompatible Ni‐doped CdSe/ZnS semiconductor nanocrystals for cellular imaging and sorting

Structural Modifications and Enhanced Thermoelectric Performance of CuI Nanoparticles Induced via Al‐Doping

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Effect of Ni doping on the structural, optical and morphological properties of CdSe QDs by chemical precipitation method

Cited by 11 publications

References 25 publications

Sensitive Detection of Aqueous Methanol by Electrochemical Route Using Mesoporous α-Fe2O3 Doped CdSe Nanostructures Modified Glassy Carbon Electrode

Sensitive Detection of Aqueous Methanol by Electrochemical Route Using Mesoporous α-Fe2O3 Doped CdSe Nanostructures Modified Glassy Carbon Electrode

Biocompatible Ni‐doped CdSe/ZnS semiconductor nanocrystals for cellular imaging and sorting

Structural Modifications and Enhanced Thermoelectric Performance of CuI Nanoparticles Induced via Al‐Doping

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Sensitive Detection of Aqueous Methanol by Electrochemical Route Using Mesoporous α-Fe₂O₃ Doped CdSe Nanostructures Modified Glassy Carbon Electrode

Sensitive Detection of Aqueous Methanol by Electrochemical Route Using Mesoporous α-Fe₂O₃ Doped CdSe Nanostructures Modified Glassy Carbon Electrode