Synthesis, Surface Modification and Optical Properties of Thioglycolic Acid-Capped ZnS Quantum Dots for Starch Recognition at Ultralow Concentration

Tayebi, Mahnoush; Yaraki, Mohammad Tavakkoli; Ahmadieh, Mahnaz; Mogharei, Azadeh; Tahriri, Mohammadreza; Vashaee, Daryoosh; Tayebi, Lobat

doi:10.1007/s11664-016-4792-y

Cited by 22 publications

(5 citation statements)

References 64 publications

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“…Calculations based on Equation (3) proved that QDs size was smaller than that in previous reports. [ 29,47 ] To estimate exactly the average crystallite size of TGA capped ZnS QDs versus growth time, we fitted peaks by using the method of least squares [ 48,49 ] and calculated sizes based on Equation (3). The results are shown in the Table 1 .…”

Section: Resultsmentioning

confidence: 99%

“…[25,26] In the authors' typical experiment, 297.5 × 10 -3 g of Zn(NO 3 ) 2 .6H 2 O was dissolved in distilled water to make a 10 mL solution of 0.1 m zinc nitrate. As acidic conditions unfavorably affect QDs' growth, [11,47] sodium hydroxide solution was added dropwise to zinc nitrate solution under mild stirring until pH of as-prepared solution equaled 7. The obtained solution was heated to 80 °C under consecutive stirring.…”

Section: Methodsmentioning

confidence: 99%

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Time‐Dependent Growth Rates of TGA‐Capped ZnS Nanocrystals as a Synthetic Formula for Ligand‐Capped Quantum Dots

Bui

Nguyễn

2022

Cryst. Res. Technol.

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ZnS quantum dots (ZnS QDs) are prepared in the absence and presence of thioglycolic acid (TGA) molecules by using a chemical precipitation method. The as‐prepared ZnS QDs are characterized by photoluminescence (PL), UV–vis absorption, Fourier transform infrared (FTIR), and X‐ray powder diffraction (XRD). Based on the calculation from XRD patterns, the temporal evolution of ZnS‐TGA QD size is fashioned and is in agreement with the Ostwald ripening process. The temporal evolution of ZnS–TGA QD size is divided into two regimes and two approximate expressions of growth time (t) − average size (d) as t = Ad3 + B and t = Cd2 + D (A, B, C, D are constants) for lower and higher values of t are suggested, respectively. The growth rates are large in the lower regime and are near zero in the higher regime. The time value at the frontier of these regimes is revealed as the necessary time to synthesize ZnS–TGA QDs. Under the experimental conditions, this value is 60 min (corresponding size of 1.80 nm). This study paves the way for determining the fabrication time of ligand‐capped quantum dots.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Time‐Dependent Growth Rates of TGA‐Capped ZnS Nanocrystals as a Synthetic Formula for Ligand‐Capped Quantum Dots

Bui

Nguyễn

2022

Cryst. Res. Technol.

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“…As nanosize QDs exhibit a high surface to volume ratio, surface states play a critical role in their physical and chemical behaviour and can significantly influence the absorption and luminescent properties. A wide list of recent reports confirm the potential for applications of QDs in photovoltaics (Beard et al 2014;Hillhouse and Beard 2009), light emitting devices (Zhang et al 2016;Ma et al 2013;Kagan et al 2016) and in many environmental (Tayebi et al 2016;Abbasi et al 2017) and biomedical experiments (Khan et al 2017;Liu et al 2018;Kulchat et al 2018;Biju et al 2010).…”

Section: Introductionmentioning

confidence: 92%

InP/ZnS quantum dots synthesis and photovoltaic application

et al. 2022

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In the present paper hybrid core–shell InP/ZnS quantum dots were prepared by the one pot synthesis method which does not require additional component injections and which complies more with cost requirements. The synthesized quantum dots were characterized by X-ray diffraction and optical spectroscopy methods. The applicability of the synthesized InP/ZnS core–shell particles in inverted solar cells fabricated with a step-by-step procedure which combines thermal vacuum deposition and spin-coating techniques was investigated. The resulting efficiency of the fabricated inverted solar cell is comparable to that of quantum-dot sensitized TiO2 based solar cells. Therefore, hybrid core–shell InP/ZnS particles can be considered as multifunctional light-harvesting materials useful for implementation in different types of photovoltaic devices, such as quantum dot sensitized solar cells and inverted solar cells.

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“…Another kind of fluorophore is quantum dots (QDs) which are often used in medical diagnostic applications ranging from microarray technology to in vivo imaging. They have special features which make them a suitable option for nanoscale applications including narrow emission spectra, flexibility in excitation wavelength, tunable emission wavelengths, symmetric emission bands, high brightness, good photo-stability, and high quantum yields, thus they can overcome many drawbacks of traditional organic fluorescent dyes (Karimi et al 2009; Alizadeh et al 2013; Mohagheghpour et al 2009, 2010, 2011, 2012; Mozafari et al 2013; Tayebi et al 2016a, b; Tayebi et al 2016c; Yaraki et al 2017). There is a phenomenon called the “quantum size effect” which is defined as the ability to tune the optical properties of QD by variation in the particle size which make QDs ideal candidates for the creation of diverse array of barcodes and labels (Leng etal.…”

Section: Synthesis and Optical Encoding Of Microbeadsmentioning

confidence: 99%

Multiplexed microarrays based on optically encoded microbeads

Vafajoo

Rostami

Parsa

et al. 2018

Biomed Microdevices

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In recent years, there has been growing interest in optically-encoded or tagged functionalized microbeads as a solid support platform to capture proteins or nucleotides which may serve as biomarkers of various diseases. Multiplexing technologies (suspension array or planar array) based on optically encoded microspheres have made possible the observation of relatively minor changes in biomarkers related to specific diseases. The ability to identify these changes at an early stage may allow the diagnosis of serious diseases (e.g. cancer) at a time-point when curative treatment may still be possible. As the overall accuracy of current diagnostic methods for some diseases is often disappointing, multiplexed assays based on optically encoded microbeads could play an important role to detect biomarkers of diseases in a non-invasive and accurate manner. However, detection systems based on functionalized encoded microbeads are still an emerging technology, and more research needs to be done in the future. This review paper is a preliminary attempt to summarize the state-of-the-art concerning diagnostic microbeads; including microsphere composition, synthesis, encoding technology, detection systems, and applications.

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Synthesis, Surface Modification and Optical Properties of Thioglycolic Acid-Capped ZnS Quantum Dots for Starch Recognition at Ultralow Concentration

Cited by 22 publications

References 64 publications

Time‐Dependent Growth Rates of TGA‐Capped ZnS Nanocrystals as a Synthetic Formula for Ligand‐Capped Quantum Dots

Time‐Dependent Growth Rates of TGA‐Capped ZnS Nanocrystals as a Synthetic Formula for Ligand‐Capped Quantum Dots

InP/ZnS quantum dots synthesis and photovoltaic application

Multiplexed microarrays based on optically encoded microbeads

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