Zinc Sulfide Quantum Dots Research Articles

Polyaniline/ZnS quantum dots nanocomposite as supercapacitor electrode

Zinc Sulfide quantum dots (ZnS QDs) and polyaniline (PANI) were prepared by co-precipitation and chemical oxidation polymerization methods, respectively. PANI/ZnS QDs nanocomposites as a supercapacitor electrode are presented in this work for the first time. Electrochemical properties of PANI/ZnS QDs nanocomposites were measured in 1.0 M H2SO4 using cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance techniques (EIS). PANI/ZnS QDs exhibited maximum specific capacitance values of 893.75 and 929 F/g at 0.5 A/g and 5.0 mV/s, respectively. In addition, the energy density (E) and power density (P) of PANI/ZnS QDs electrode were 178.75 W h/kg and 300 W/kg, respectively with a good cyclic stability of 97.8% after 1000 GCD cycle. ZnS QDs reduced the series resistance of supercapacitor electrode due to their small size (less than 10.0 nm), high surface area, and this promotes the contact between PANI and electrolyte and improves the electrochemical performance. A graphite electrode and PANI/ZnS QDs electrode were assembled to fabricate an asymmetric supercapacitor (ASC) and produced a specific capacitance of 358 F/g at 0.5 A/g. ASC was found to has an E of 71.6 W h /kg and P of 290.3 W/ kg.

Red CdSe/ZnS QDs' Intracellular Trafficking and Its Impact on Yeast Polarization and Actin Filament.

Quantum dots are nanoparticles (2-10 nm) that emit strong and tunable fluorescence. Quantum dots have been heavily used in high-demand commercialized products, research, and for medical purposes. Emerging concerns have demonstrated the negative impact of quantum dots on living cells; however, the intracellular trafficking of QDs in yeast cells and the effect of this interaction remains unclear. The primary goal of our research is to investigate the trafficking path of red cadmium selenide zinc sulfide quantum dots (CdSe/ZnS QDs) in Saccharomyces cerevisiae and the impact QDs have on yeast cellular dynamics. Using cells with GFP-tagged reference organelle markers and confocal microscopy, we were able to track the internalization of QDs. We found that QDs initially aggregate at the exterior of yeast cells, enter the cell using clathrin-receptor-mediated endocytosis, and distribute at the late Golgi/trans-Golgi network. We also found that the treatment of red CdSe/ZnS QDs resulted in growth rate reduction and loss of polarized growth in yeast cells. Our RNA sequence analysis revealed many altered genes. Particularly, we found an upregulation of DID2, which has previously been associated with cell cycle arrest when overexpressed, and a downregulation of APS2, a gene that codes for a subunit of AP2 protein important for the recruitment of proteins to clathrin-mediated endocytosis vesicle. Furthermore, CdSe/ZnS QDs treatment resulted in a slightly delayed endocytosis and altered the actin dynamics in yeast cells. We found that QDs caused an increased level of F-actin and a significant reduction in profilin protein expression. In addition, there was a significant elevation in the amount of coronin protein expressed, while the level of cofilin was unchanged. Altogether, this suggests that QDs favor the assembly of actin filaments. Overall, this study provides a novel toxicity mechanism of red CdSe/ZnS QDs on yeast actin dynamics and cellular processes, including endocytosis.

A dual-emitting immunosensor based on manganese dioxide nanoflowers and zinc sulfide quantum dots with enhanced electrochemiluminescence performance for the ultrasensitive detection of procalcitonin.

A dual-emitting electrochemiluminescence (ECL) immunosensor based on manganese dioxide nanoflowers (MnO2NFs) and zinc sulfide quantum dots (ZnSQDs) was constructed for the first time to sensitively detect procalcitonin (PCT) in human serum. rGO@Ag functioned not only to adsorb primary antibodies (Ab1) but also to improve the electrical conductivity of the immunosensor. The MnO2NFs and ZnSQDs in the nanocomposite, synergistically with silver nanoparticles, simultaneously functioned as cathodic ECL emitters to enhance the detection sensitivity of PCT by shortening the electron-transfer path, thereby reducing energy loss. Under the optimized experimental conditions, the ECL immunosensor was capable of quantitatively detecting PCT in the linear range of 0.1 pg mL-1 to 100 ng mL-1 and over the scanning potential range of -2.0-0 V, with a detection limit of 0.033 pg mL-1. Furthermore, the ECL immunosensor demonstrated high specificity for PCT in the presence of other competing antigens, excellent stability over 10 cycles, and excellent reproducibility, corroborating its potential for measuring PCT concentrations in clinical samples.

Enhanced photodegradation of organic contaminants using V-ZnSQDs@TiO2 photocatalyst in an aqueous medium.

Vanadium-doped zinc sulfide quantum dots complexed with TiO2 have been designed using the sol-gel technique and characterized using analytical techniques, such as X-ray diffraction analysis (XRD), UV-Vis diffuse reflectance spectra (DRS), Fourier transforms Infra Red (FTIR), Brunauer-Emmett-Teller analysis (BET),X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and transmission electron microscopy (TEM). The X-ray diffraction analysis of the composite material showed sharp peaks corresponding to both TiO2 and ZnSQDs. The FTIR analysis exhibits a strong and broad absorption at 807cm-1 indicating the assimilation of vanadium metal in the ZnSQDs lattice. The DRS spectra showed a bathochromic shift of 25nm in the synthesized V-ZnSQDs@TiO2 composite compared with the pure sample. The photocatalytic performance of the synthesized composite was tested by studying the degradation of two different chromophoric organic dyes, rhodamine B (RhB), methylene blue (MB) and a drug derivative paracetamol (PCM) in aqueous suspension under UV-light illumination. Among the synthesized materials, the composite (V-ZnSQDs@TiO2) was established to be more active than the pure ZnSQDs, TiO2, and V-ZnSQDs for the degradation of compounds under investigation. The activity of the synthesized catalyst was also tested for the mineralization of all compounds by measuring the depletion in total organic carbon (TOC) at different irradiation times. The results showed that the catalyst degrades the compounds and mineralizes them efficiently. The primary reactive species involved in the photodegradation reaction were determined by quenching studies, terephthalic acid, and NBT probe methods. A probable mechanistic pathway for the decomposition of compounds has been proposed.

Application of thiol capped ZnS quantum dots as a fluorescence probe for determination of tetracycline residues

A new rapid and sensitive fluorescence probe based on zinc sulfide (ZnS) quantum dots (QDs) as an eco-friendly alternative has been produced for the detection of tetracycline (TCy). ZnS QDs have been innovatively prepared via simple aqueous colloidal method with thioglycolic acid (TGA) as a stabilizer and characterized by infrared spectroscopy, X-ray diffraction, transmission electron microscopiy, UV–Visible absorption and photoluminescence spectroscopy. The blue shift of the absorption band and bandgap values with respect to that of bulk ZnS materials confirms the quantum confinement effect. IR spectra show the binding of TGA to the surface of ZnS QDs. X-ray diffraction confirms the formation of a cubic phase of ZnS. Temperature-dependent photoluminescence (PL) spectroscopy shows three emission bands at 405 nm, 442 nm and 483 nm ascribed to electronic transitions involving Zn and S vacancies and interstitial sites. TGA-ZnS QDs is.able to detect TCy in an aqueous medium with a pH compatible with the pH of biological fluids which highlight the flexibility and applicability of this sensor in real media. Regarding TCy detection by QD fluorescence, a linear relationship of fluorescence intensity and TCy concentration is obtained over the wide range of 25–6000 nM, and the limit of detection (LOD) is as low as 0.03 nM. Thanks to its excellent analytical performance, such ZnS QDs fluorescent probe is a promising sensing platform for the analysis of trace TCy in biological fluids. Current probe was applied for TCy quantification in milk samples with superior results.

Hydrophilic, dual amino acid-functionalized zinc sulfide quantum dot for specific identification of N-glycopeptides from biological samples.

Glycosylation of proteins is one of the most significant and complex post-translational modifications, and N-glycosylation plays a crucial role in life activities. Mass spectrometry (MS) has been a powerful technique in the analysis of protein glycosylation. However, the direct detection of glycoproteins in biological samples based on MS still suffers from huge challenges. Therefore, enrichment and purification of samples before MS analysis is an essential prerequisite. Hydrophilic interaction liquid chromatography (HILIC) has significantly developed for selective enrichment of glycopeptides due to its simple operation process and unbiased enrichment. Herein, hydrophilic, dual amino acid-functionalized zinc sulfide quantum dots (ZnS QDs) were prepared to enrich glycopeptides using an easy procedure. The enriched glycopeptides were detected using matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS). The obtained material exhibited high selectivity (1:2000), low detection limit (0.1 fmol/μl), good repeatability (10 times), and excellent recovery (89.8%) in glycopeptide enrichment. In the actual application in biological samples, 71 N-glycopeptides and 161 N-glycopeptides were detected from human saliva and serum, respectively. ZnS-Au-GC was successfully prepared using an easy method. The results showed that the obtained material exhibited excellent performance in glycopeptide enrichment. Furthermore, it had showed great potential for glycopeptide enrichment in complex biological samples.

Single-phase colour-tunable yellow light copper doped zinc sulfide quantum dots for fabrication of white LEDs

To achieve large-scale commercialized use of white quantum dots light-emitting diodes (WQLEDs). It is vital to find environmentally friendly and inexpensive luminescent materials without rare earth participation. In this paper, the zinc sulfide quantum dots with different Cu2+ contents (ZnS:Cu-QDs) were prepared by one-step hydrothermal method, the quantum yield can reach 27.65 % and the thermal decomposition temperature is 610 ℃. Furthermore, the luminescence mechanism of ZnS:Cu-QDs was explored. The wavelength-tunable WQLEDs were fabricated. The WQLEDs exhibit from standard white light to warm white light with a relative colour temperature in the range of 4764–3851 K. The as-prepared WQLEDs from ZnS:Cu0.8 %-QDs show a warm white light with International Commission on Illumination (CIE) coordinates of (0.4009, 0.4265), colour rendering index (CRI) of 72.1, and the correlated colour temperature (CCT) of 3851 K at an input voltage of 3.4 V. This research provides a promising way for achieving WQLEDs by single phase quantum dots without the addition of rare-earth elements.

Molecular Imprinted ZnS Quantum Dots-Based Sensor for Selective Sulfanilamide Detection.

Combining molecular imprinted polymers and water-soluble manganese-doped zinc sulfide quantum dots (Mn2+: ZnS QDs), a new molecule imprinted polymers-based fluorescence sensor was designed. The molecule imprinted quantum dots (MIP@QDs) were constructed by coating molecular imprinted polymers layer on the surface of ZnS: Mn2+ QDs using the surface molecular imprinting technology. The developed MIP@QDs-based sensor was used for rapid and selective fluorescence sensing of sulfanilamide in water samples. The binding experiments showed that the MIP@QDs has rapid fluorescent responses, which are highly selective of and sensitive to the detection of sulfanilamide. The respond time of the MIP@QDs was 5 min, and the imprinting factor was 14.8. Under optimal conditions, the developed MIP@QDs-based sensor shows a good linearity (R2 = 0.9916) over a sulfanilamide concentration range from 2.90 × 10−8 to 2.90 × 10−6 mol L−1, with a detection limit of 3.23 × 10−9 mol L−1. Furthermore, the proposed MIP@QDs-based sensor was applied to the determination of sulfanilamide in real samples, with recoveries of 96.80%–104.33%, exhibiting good recyclability and stability. Experimental results showed that the prepared MIP@QDs has the potential to serve as a selective and sensitive sensor for the fluorescence sensing of sulfonamides in water samples.

Luminescent Manganese/Europium doped ZnS quantum dots: Tunable emission and their application as fluorescent sensor

Manganese and europium doped zinc sulphide (Mn2+/Eu3+@ZnS) quantum dots (QDs) were prepared via direct aqueous route in order to broaden tunable emission. We report a new strategy featuring enhanced photoluminescence through Mn2+/Eu3+@ZnS QDs leading to an intense orange-red emission and thus remarkably enhancing PL QY up to 41.35%. The X-ray diffraction (XRD) and Transmission Electron Microscope (TEM) studies revealed the cubic crystalline structure with average crystalline sizes in the range of 1.5–2.5 nm. The Mn2+/Eu3+@ ZnS QDs was applied as an exceptional chemical sensor for Cu2+ via quenching mechanism due to competitive coordination between QDs and Cu2+ with the limit of detection (LOD) of 0.036 μM. Furthermore, the proposed approach is capable of detecting Cu2+ in water samples with satisfactory recoveries highlighting viability and prospective applications of the sensing platform. We finally demonstrate from CIE Chromaticity diagram that doped QDs show meliorated colorimetric properties which render this new class of QDs a promising prospect to be employed in white LEDs.

Synthesis, feasibility study of production of singlet oxygen and hydroxyl radical and performance in antibacterial activity of ZnS:Eu QDs

 ZnS:Eu nanoparticles also have the ability to produce reactive oxygen species that can be used to treat cancers. Eu doped zinc sulfide quantum dots (QDs) were prepared by the chemical Co-precipitation method. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and infrared Fourier transform (FT-IR) analysis were used to characterize the quantum dots. The photoluminescence spectrum (PL) of ZnS:Eu QD in excitation wavelength of 280 nm shows two emission peaks at 384 and 715 nm. In order to use these QDs as photosensitizer in photodynamic therapy, anthracene and methylene blue chemical detectors were used for detection of singlet oxygen and hydroxyl radical, respectively. The significant point for these quantum dots is that, in addition to production of hydroxyl radical, they also have the ability to produce singlet oxygen with UV-C radiation. The antimicrobial effect of ZnS:Eu QDs was also investigated using a disc diffusion method on 11 microbial strains. Zinc sulfide nanoparticles with Europium impurities can have good medical application due to their good antibacterial activity and ability to produce reactive oxygen species.

Detection and separation of silver ions from industrial wastewaters using fluorescent d-glucose carbon nanosheets and quaternary silver indium zinc sulphide quantum dots

Carbon nanomaterials are essential for functions such as electronic connectivity, wastewater purification, energy and environmental sustainability applications. In this report, fluorescent carbon nanosheet was obtained from d-glucose (F-GCNS) via a low-temperature in-situ pyrolysis. The as-synthesized F-GCNS were characterized using conventional spectroscopic and microscopic techniques. Furthermore, the nanosheets were used to detect and separate silver ions (Ag+) from aqueous solutions with a detection limit (LOD) of 1.74 ppm and about 98.42 ± 0.69 % removal for concentrations ranging between 0 and 20 ppm and 100 and 200 ppm respectively. Comparably, at all concentrations, the nanosheets exhibited an LOD better than that of the quaternary silver indium zinc sulphide quantum dots (Glu-AISZ) (LOD = 7.96, R2 0.6524 for 0–20 ppm and 28.01, R2 = 0.95418 for 30–100 ppm respectively). The F-GCNS showed attractiveness for simultaneous detection and removal of heavy metal pollutants from industrial wastewater.

Fluorescent sensor based on thiourea capped Mn doped ZnS quantum dots for the sensing of Cu2+ ions in water

In the present study the utilization of a simple, rapid, and highly effective “turn-off” fluorescent sensor based on thiourea capped manganese doped zinc sulphide quantum dots for the detection of Cu2+ ions in water is described for the first time. The quantum dots are prepared by a simple and facile chemical precipitation method. The developed quantum dots are characterized by UV–vis., FT-IR, photoluminescence, XRD, and TEM techniques. The doping by manganese is confirmed by a peak at 598 nm in the PL spectrum. The sensor exhibit high sensitivity and selectivity towards copper ion at pH 9 with a limit of detection of 20.75 nM. The obtained results are also reasonable in real sample analysis.

Copper doped zinc sulfide quantum dots as ratiometric fluorescent probes for rapid and specific detection of tetracycline residues in milk

In this work, copper-doped zinc sulfide quantum dots (ZnS:Cu QDs) were developed as ratiometric fluorescent probes to detect tetracycline (TC) in milk. With the increasing of TC concentration, the fluorescence at 578 nm of ZnS:Cu QDs was quenched, while a new fluorescence at 520 nm was significantly enhanced due to the formation of a green-emitting complex of Zn2+ and TC on the surface of probes. The fluorescence intensity ratio (I520/I578) have a good linear relationship (R2 = 0.98) with the concentration of TC in the range of 0.2–2.0 μM. The detection limit was calculated to 149 nM, which is lower than the allowable level of TC (about 180 μM) in milk set by the US Food and Drug Administration (FDA). Finally, the fluorescent test papers have been also prepared using ZnS:Cu QDs as ink by painting on a piece of filter paper. With the addition of TC, the orange test paper produced green spots that became more and more obvious with a dose-discerning ability as low as 2 μM. This work demonstrated a great potential of ratiometric fluorescent probe for the easy and visual detection of TC in complicated real samples.

Hybrid nanocomposite packaging films from cellulose nanocrystals, zinc sulfide quantum dots reinforced polylactic acid with fluorescent and antibacterial properties

AbstractIn this study, nanocomposite thin films from cellulose nanocrystals (CNCs), zinc sulfide (ZnS) quantum dots, and polylactic acid (PLA) with fluorescent and antibacterial properties were constructed via a simple, and fast route. ZnS nanoparticles were added to CNC following the hydrothermal process. The film casting method was used to form thin nanocomposite films. The transmission electron microscope analysis revealed the uniform dispersion and ZnS nanoparticles through CNC suspension and FTIR results confirmed the interaction between –OH group on CNC and ZnS nanoparticles. A noticeable emission peak at 475 nm for CNC‐ZnS signifies the suitability of CNC‐ZnS for the assembly of ZnS QDs. The addition of ZnS‐coated CNC into PLA film resulted in a bright blue fluorescence when exposed to ultraviolet light. The incorporation of 5 wt% CNCs loaded with ZnS quantum dots into PLA notably decreased bacterial growth in Escherichia coli and Salmonella, respectively. Data obtained from dynamic mechanical analysis underlined that the presence of 1 wt% ZnS‐coated CNC in PLA increased the storage modulus of nanocomposite films by 25%. The CNCs loaded with ZnS quantum dots showed effective fluorescent and antimicrobial properties to be used as food packaging material.

A sensitive fluorescence-visualized sensor based on an InP/ZnS quantum dots-sodium rhodizonate system for monitoring fish freshness

A fluorescence-visualized sensor based on 3-mercaptopropionic acid (MPA)-capped indium phosphide/ zinc sulfide quantum dots (InP/ZnS QDs) and sodium rhodizonate (SR) was designed to sensitively monitor fish freshness. MPA-InP/ZnS QDs, which exhibit orange-red fluorescence, were synthesized by a solvothermal method. In the MPA-InP/ZnS QDs-SR system, the fluorescence of MPA-InP/ZnS QDs was quenched by SR due to the combined function of the inner filter effect (IFE) and static quenching effect (SQE) at pH = 3. When ammonia was added, the fluorescence was recovered, and the color changed from colorless to bright orange-red under UV light (365 nm). The sensing performance for volatile amine gas was studied, and the sensor demonstrated good linearity between the fluorescence intensity, the total volatile basic nitrogen (TVB-N) and the total color change (ΔE) of bighead carp stored at room temperature (25 °C) and refrigerated temperature (4 °C). The proposed sensor has potential applications in monitoring fish freshness.

Ultra-small ZnS quantum dots embedded in N-doped carbon matrix for high-performance Li-ion battery anode

We report zinc sulfide (ZnS) quantum dots composed of three different polymorphs (pure zinc blende, pure wurtzite, and poly-type (zinc blende/wurtzite)) uniformly embedded in an N-doped carbon matrix as a potential electrode material for anode applications in lithium-ion batteries (LIBs), for the first time. The ZnS polymorph quantum dots with cubic and hexagonal lattices anchored onto a N-doped carbon matrix ([email protected]) electrode is prepared by a polyol-assisted pyro-synthesis technique. A combined operando XRD and ex-situ XAS analyses revealed that the electrochemical reaction mechanism in [email protected] was reversible and comprised of an insertion reaction followed by a conversion-cum-alloying reaction. Due to the structural property of the composite and its unique electrochemical behavior, the [email protected] electrode registers a reversible specific capacity as high as 800 mAhg−1 with a high initial energy round-trip efficiency of 83%, and better cycling stability and power. The results from this study can help in the production of high-performance electrode materials with unique structural and morphological composition using an efficient pyro-synthetic reaction for rechargeable battery applications.

Different metal-doped ZnS quantum dots photocatalysts for enhancing the permeability and antifouling performances of polysulfone membranes with and without UV irradiation

In this study, the effect of three different transition metal ion dopants (Mn2+, Fe2+, and Co2+) on the characteristics of zinc sulfide (ZnS) quantum dots (QDs) was investigated and the obtained QDs photocatalysts were applied for the modification of polysulfone (PSf) mixed matrix membranes to reduce membrane fouling. The synthesized QDs and fabricated membranes were fully identified with SEM, TEM, AFM, FTIR analyses, and also underwent porosity and contact angle tests. Flux recovery ratios (FRR) significantly increased from 69.8% (bare) to 85.0% (1% Fe-doped ZnS QDs) after modification of membranes with metal-doped QDs. The contact angles of the prepared membranes decreased with doping of dissimilar metals, therefore hydrophilicity increased, and reversible/non-reversible blockages were improved. Besides, the use of UV irradiation during the washing of the membranes increased the FRR of the photocatalytic activated membranes to 91.2%. Compared to the bare PSf membrane in dye solution filtration, 1% Fe-doped ZnS QDs membrane yielded twice as much flux and 15% higher FRR results. Therefore, the results proved that metal-doped QDs can be used in the modification of PSf membranes with high efficiency.

Optical, anticancer, photoluminescent, and electrochemical properties of crystalline ZnS quantum dots

AbstractIn this study, we report the fabrication of binary chalcogenide zinc sulfide (ZnS) quantum dots (QDs) paying a facial, economical, eco‐friendly, and template‐free chemical method. The as‐synthesized nanomaterial has a single cubic phase; based on its structural features, it was confirmed that the nanoparticles are grown as QDs (2‐10 nm). Morphological studies display the formation of agglomerated QDs (3 nm). The energy‐dispersive spectroscopy shows that the essential elements are in the stoichiometric ratio as in the precursor solutions. Optical properties confirmed that the QDs are suitable for optoelectronic devices revealing room‐temperature photoluminescence. The charge‐storage electrochemical activity was explored via electrochemical characterization performances. Electrochemical studies show that the synthesized material has charge storage ability. And according to the International Commission on Illumination, the ZnS QDs show green emission, thus presenting that the material will be useful for biological applications. In addition, these nanoparticles exhibit incredible anticancer activities especially against breast cancer cells and may be used for biological or biomedical applications as well.

Interaction of hyperaccumulating plants with Zn and Cd nanoparticles

Metal hyperaccumulating plant species are an interesting example of natural selection and environmental adaptation but they may also be useful to developing new technologies of environmental monitoring and remediation. Noccaea caerulescens and Arabidopsis halleri are both Brassicaceae and are known metal hyperaccumulators. This study evaluated tolerance, uptake and translocation of zinc sulfide quantum dots by N. cearulescens and cadmium sulfide quantum dots by A. halleri in direct comparison with the non-hyperaccumulator, genetically similar T. perfoliatum and A. thaliana. Growth media were supplied with two different concentrations of metal in either salt (ZnSO4 and CdSO4) or nanoscale form (ZnS QDs and CdS QDs). After 30 days of exposure, the concentration of metals in the soil, roots and leaves was determined. Uptake and localization of the metal in both nanoscale and non-nanoscale form inside plant tissues was investigated by Environmental Scanning Electron Microscopy (ESEM) equipped with an X-ray probe. Specifically, the hyperaccumulators in comparison with the non-hyperaccumulators accumulate ionic and nanoscale Zn and Cd in the aerial parts with a BCF ratio of 45.9 for Zn ion, 49.6 for nanoscale Zn, 2.64 for Cd ion and 2.54 for nanoscale Cd. Results obtained with a differential extraction analytical procedure also showed that a significant fraction of nanoscale metals remained inside the plants in a form compatible with the retention of at least a partial initial structure. The molecular consequences of the hyperaccumulation of nanoscale materials are discussed considering data obtained with hyperaccumulation of ionic metal. This is the first report of conventional hyperaccumulating plants demonstrating an ability to hyperaccumulate also engineered nanomaterials (ENMs) and suggests a potential novel strategy for not only understanding plant-nanomaterial interactions but also for potential biomonitoring in the environment to avoid their entering into the food chains.

Synthesis of colloidal ZnS quantum dots

Nanomaterials are important class of materials due to their size and shape-dependent properties as compared to bulk materials. As a result, nanomaterials are increasingly interested in the technological applications of fundamental research. Among these semiconductor quantum dots (QDs) are a significant class of nanomaterials. Zinc Sulfide (ZnS) is an important semiconductor belongs to II–VI group in periodic table, a wide bandgap semiconductor, bulk energy gap 3.6 eV, with exciton binding energy of 39 meV, which is easily synthesizable material and chemically stable as compared to other chalcogenides and hence many research pronounced on zinc sulfide. Herein, we report the synthesized of Zinc Sulfide QDs by the chemical precipitation method using thioglycolic acid (TGA) as a capping agent and hydrazine hydrate-sulphur complex plays avital role in the growth ZnS QDs. The synthesized ZnS QDs were characterized using UV–visible absorption spectroscopy, photoluminescence spectroscopy (PL) , XRD, FTIR, SEM and TEM. To support the formation of ZnS QDs, XRD spectrum results the arrangement of ZnS in the cubic crystal system. The estimated particle size is 2.62 nm. The ZnS QDs are stable, fluorescent and spherical in shape as noted by the results of the PL spectral analysis and TEM images. The produced ZnS QDs are amorphous in nature and can be used in the applications like sensors, Field Emitting Diodes (FET), electroluminescence, flat panel displays and photocatalysis.