Manufacturing of nanoflowers crystal of ZnQ2 by a co-precipitation process and their morphology-dependent luminescence properties

Shahedi, Zahra; Zare, Hakimeh; Sediqy, Abdulwares

doi:10.1007/s10854-021-05389-5

Cited by 6 publications

(4 citation statements)

References 47 publications

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“…The strong absorption band of Znq 2 @ZIF-8 at 257 nm and the broad absorption band near 360 nm are attributed to π–π* electron-leap absorption in the quinoline ring and charge transfer from the electron donor O to the acceptor N, respectively. 15 8-HQ–based metal coordination compounds have high fluorescence, whereas a single 8-HQ has low fluorescence due to excited-state intramolecular proton transfer (ESIPT). The formation of a coordination structure with metal ions, blocks the ESIPT channel, thus restoring strong fluorescence emission.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, there are also C=N stretching vibration peaks and Zn-N bond stretching vibration peaks at 1580 and 420 cm −1 for Znq 2 , and the characteristic vibrational absorption of the benzene ring skeleton at 1500 and 1467 cm −1 by quinoline structure, the stretching vibration absorption of the C-O bond at 1279 and 1114 cm −1 , and the absorption belonging to Zn-O and Zn-N in the range of 400-600 cm −1 , these peaks are also present in Znq 2 @ZIF-8. 15 As shown in X-ray diffraction analysis (XRD) diffraction pattern (Figure 3(b)), the characteristic diffraction peaks of Znq 2 located at 8.9°, 10.9°, 13.7°, and 22.6° correspond to the four crystal planes of (023), ( 110), (101), and (311), respectively, 16 which appear in Znq 2 @ZIF-8. Similarly, the diffraction peaks located at 7.4°, 12.8°, 14.7°, 16.5°, and 18.1° in ZIF-8 are attributed to the five crystal faces (011), ( 112), ( 022), (013), and (222) of the ZIF-8 crystal, respectively, 17 and the corresponding diffraction peaks can be found in the XRD pattern of Znq 2 @ZIF-8.…”

Section: Characterization Of Morphology and Structurementioning

confidence: 94%

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Fluorescent probe for Fe³⁺ detection based on a guest molecular luminescent metal–organic framework

Yang,

Xu,

et al. 2024

Journal of Chemical Research

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The zinc(II) bis-(8-hydroxyquinoline) (Znq2) has excellent photoluminescence properties, and its fluorescence emission can be significantly quenched by Fe3+ in water. To accelerate the detection response of Znq2 to Fe3+, a luminescent metal–organic framework Znq2@ZIF-8 based on guest molecular luminescence was constructed by growing zeolite imidazolate framework-8 (ZIF-8) on the outer surface of Znq2. The results show that the prepared Znq2@ZIF-8 has an octahedral core–shell structure, a particle size of approximately 1–3 μm, an enhanced specific surface area of 1105.41 m2 g−1, and with a stable green luminescence at 495 nm. A fluorescence analytical method was developed for the detection of Fe3+ in water, the correlation coefficients were significant in the Fe3+ concentration range of 0–600 μmol L−1, and the limit of detection was as low as 3.89 μmol L−1. The spiked recoveries of tap water samples demonstrated that the method could be applied to practical applications. The mechanism of fluorescence detection is that Fe3+ participates in the competitive coordination of Znq2@ZIF-8 metal centers, leading to the collapse of the crystal structure, meanwhile, Fe3+ produces a certain degree of competitive absorption of the excitation light of Znq2@ZIF-8. This method was applied for the detection of Fe3+ in water with good selectivity, anti-interference ability, and has the potential to be used as a rapid detection method.

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Section: Resultsmentioning

confidence: 99%

Section: Characterization Of Morphology and Structurementioning

confidence: 94%

Fluorescent probe for Fe³⁺ detection based on a guest molecular luminescent metal–organic framework

Yang,

Xu,

et al. 2024

Journal of Chemical Research

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“…Metal quinolines (MQs) are small molecules that have been used in organic optoelectronic devices [ 18 , 19 , 20 , 21 , 22 ] due to their ability to form thin films in solution [ 18 , 23 , 24 , 25 ] and by evaporation [ 19 , 22 , 26 , 27 ] since they exhibit high chemical and thermal stability. MQs also offer easy color tunability with simple synthesis [ 28 , 29 , 30 , 31 ], magnetism properties [ 32 ] and electron transport behavior [ 23 , 28 , 33 ]. Moreover, the fluorescence of MQs has led to their classification as an important class of electro-luminescent/electron transport materials [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Hybrid Films Based in Aluminum 8-Hydroxyquinoline as Organic Semiconductor for Photoconductor Applications

Sánchez Vergara,

Cantera Cantera,

Rios

et al. 2023

Sensors

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In the present work, we have investigated an organic semiconductor based on tris(8-hydroxyquinoline) aluminum (AlQ3) doped with tetracyanoquinodimethane (TCNQ), which can be used as an organic photoconductor. DFT calculations were carried out to optimize the structure of semiconductor species and to obtain related constants in order to compare experimental and theoretical results. Subsequently, AlQ3-TCNQ films with polypyrrole (Ppy) matrix were fabricated, and they were morphologically and mechanically characterized by Scanning Electron Microscopy, X-ray diffraction and Atomic Force Microscopy techniques. The maximum stress for the film is 8.66 MPa, and the Knoop hardness is 0.0311. The optical behavior of the film was also analyzed, and the optical properties were found to exhibit two indirect transitions at 2.58 and 3.06 eV. Additionally, photoluminescence measurements were carried out and the film showed an intense visible emission in the visible region. Finally, a photoconductor was fabricated and electrically characterized. Applying a cubic spline approximation to fit cubic polynomials to the J-V curves, the ohmic to SCLC transition voltage VON and the trap-filled-limit voltage VTFL for the device were obtained. Then, the free carrier density and trap density for the device were approximated to n0=4.4586×10191m3 and Nt=3.1333×10311m3, respectively.

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“…Znq 2 has shown in front of aluminum tris (8-hydroxyquinoline) (Alq 3 ), which is the leader in its field in terms of luminescence efficiency and high quantum efficiency at a low operating voltage (Shahedi et al 2017). This makes it an attractive material in various applications, such as medicine, photovoltaics, photonics, optoelectronics, and especially for OLED applications (Yuan et al 2021;Shahedi et al 2021). On the other part, photoluminescence is a field that has been expanding and refining since the 1970s (Gilliland 1997).…”

Section: Introductionmentioning

confidence: 99%

Generation of red light with intense photoluminescence assisted by Forster resonance energy transfer from Znq2 and DCM thin films

Laouid

Belghiti

Wiśniewski

et al. 2022

Environ Sci Pollut Res

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In this work, a novel experimental investigation of photoluminescence properties of Znq2 thin films co-doped with different concentrations of DCM were performed. The thin films were successfully deposited on glass substrates with different compositions, under high vacuum, by using the vacuum evaporation technique. For all compositions, the photoluminescence was measured at room temperature and also at low temperature in a wide range from 77 to 300 K with a step of 25 K in a high vacuum. The lifetime of the sample studied in real time was also measured using the decay time technique. The results obtained confirm that the doping influences the intensity of the DCM photoluminescence and also shows a complete energy transfer occurred from Znq2 to DCM which may have shifted the photoluminescence peak from Znq2 to the orange wavelength region which is related to DCM. The lifetime of the sample studied in real time was about 4.47 ns for Znq2 and while all the other samples showed two decay time components. As a result, the doping influences the optical properties of Znq2 and makes it a potential candidate for optoelectronic applications. Graphical abstract

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Manufacturing of nanoflowers crystal of ZnQ2 by a co-precipitation process and their morphology-dependent luminescence properties

Cited by 6 publications

References 47 publications

Fluorescent probe for Fe³⁺ detection based on a guest molecular luminescent metal–organic framework

Fluorescent probe for Fe³⁺ detection based on a guest molecular luminescent metal–organic framework

Preparation of Hybrid Films Based in Aluminum 8-Hydroxyquinoline as Organic Semiconductor for Photoconductor Applications

Generation of red light with intense photoluminescence assisted by Forster resonance energy transfer from Znq2 and DCM thin films

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Manufacturing of nanoflowers crystal of ZnQ2 by a co-precipitation process and their morphology-dependent luminescence properties

Cited by 6 publications

References 47 publications

Fluorescent probe for Fe3+ detection based on a guest molecular luminescent metal–organic framework

Fluorescent probe for Fe3+ detection based on a guest molecular luminescent metal–organic framework

Preparation of Hybrid Films Based in Aluminum 8-Hydroxyquinoline as Organic Semiconductor for Photoconductor Applications

Generation of red light with intense photoluminescence assisted by Forster resonance energy transfer from Znq2 and DCM thin films

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Fluorescent probe for Fe³⁺ detection based on a guest molecular luminescent metal–organic framework

Fluorescent probe for Fe³⁺ detection based on a guest molecular luminescent metal–organic framework