Tuning luminescence of the fluorescent molecule 2-(2-hydroxyphenyl)-1<i>H</i>-benzimidazole <i>via</i> zeolitic imidazolate framework-8

Zhang, Yuyi; Zhang, Wei; Bian, Yajie; Liu, Yiting; Zhang, Xiaolei; Chen, Mengdi; Hu, Bingwen

doi:10.1039/d1ra09446g

Cited by 4 publications

(5 citation statements)

References 63 publications

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“…The role that ZIF-8 played in tuning HPBI molecular fluorescence has already been studied in our previous work, [40] and in the present work the fluorescence results of ZIF-8 mixed with HPBI molecules were mainly used as a comparison with AuNPs@ZIF-8. In our previous work, [40] we had already investigated that when ZIF-8 was added to the HPBI solution, the PL intensity of the mixture increased as the blending time increased from 5 min to 120 min. From 120 min to 240 min, the increment slowed down, and by the end of 16 h, the PL intensity had no obvious enhancement.…”

Section: Resultsmentioning

confidence: 93%

“…The mixture was also accompanied by a blue shift, which can be attributed to Zn 2+ . [40] All results indicate that the pores of ZIF-8 can limit the vibration and rotation of the molecules, resulting in increased emission efficiency, [44] and that there is a π-π stacking between the benzene ring of HPBI and the imidazole ring in the ZIF-8 structure. [45,46] We have already obtained the effects of ZIF-8 crystals and AuNPs on the fluorescence properties of HPBI molecules.…”

Section: Resultsmentioning

confidence: 93%

“…The saturation concentration is equal to what we previously received. [40] As the solution concentration continues to increase, it can be found that the concentration has almost no effect on ∆I and remains at a lower enhancement intensity ratio. The mixture was also accompanied by a blue shift, which can be attributed to Zn 2+ .…”

Section: Resultsmentioning

confidence: 93%

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Molecular fluorescence significantly enhanced by gold nanoparticles@zeolitic imidazolate framework-8

et al. 2023

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Noble metal nanoparticles exhibit unique surface plasmon resonance dependent optical properties. On this basis, gold nanoparticles (AuNPs) encapsulated in metal-organic frameworks (MOFs) can form AuNPs@MOFs composites to modulate the optical properties of fluorescent molecules, which is less reported. In this paper, based on the fluorescence enhancement effect of AuNPs on 2-(2-Hydroxyphenyl)-1H-benzimidazole (HPBI) molecules, zeolitic imidazolate framework-8 (ZIF-8) crystals with structural stability were introduced. AuNPs@ZIF-8 exhibited a significantly pronounced fluorescence enhancement of the HPBI molecules. In addition, by comparing the fluorescence characteristics of the HPBI molecules adsorbed on AuNPs@ZIF-8 and the ones captured in AuNPs@ZIF-8, we found that the ZIF-8 can act as a spacer layer with highly effective near-field enhancement. All our preliminary results throw light on future research on the composite structures of noble metal particles and MOFs for fluorescent probes and sensing applications.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 93%

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Molecular fluorescence significantly enhanced by gold nanoparticles@zeolitic imidazolate framework-8

et al. 2023

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“…The high porosity and regular channels of MOFs make them a kind of ideal host materials. The properties of the guest fluorescent molecules may be changed after being integrated into MOFs. − Recently, we also found that zeolitic imidazolate framework-8 (ZIF-8) nanoparticles could tune the luminescence of a specific fluorescent molecule 2-(2-hydroxyphenyl)-1 H -benzimidazole (HPBI) and achieve significant fluorescence enhancement . However, unlike metallic particles, which have been found to employ the plasmonic resonance to achieve fluorescence enhancement, − it is still unclear how MOF particles accommodate the fluorescent molecules and therefore exhibit enhanced fluorescence.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Strong Fluorescence Enhancement of HPBI Molecules by ZIF-8 Colloidal Suspensions via Adsorption Analysis

Zhang

Yuan

et al. 2023

Langmuir

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Enhancing the fluorescence of organic dye by colloidal particles is one of the most promising routes to optimize fluorescence detection. However, in addition to metallic particles, which serve as the most frequently used particles and have been found to employ the plasmonic resonance to provide strong fluorescence enhancement, neither new types of colloidal particles nor new fluorescence mechanisms have been intensively explored in recent years. In this work, strongly enhanced fluorescence was observed when 2-(2-hydroxyphenyl)-1H-benzimidazole (HPBI) molecules were simply mixed with zeolitic imidazolate framework-8 (ZIF-8) colloidal suspensions. Moreover, the enhancement factor ΔI = I HPBI+ZIF‑8/IHPBI does not increase accordingly with the increasing amount of HPBI. To find out how the strong fluorescence was triggered and affected by the amount of HPBI, multiple techniques were applied to analyze the adsorption behavior. By combining analytical ultracentrifugation with first-principles calculations, we proposed that HPBI molecules were adsorbed onto the surface of ZIF-8 particles coordinatively and electrostatically, depending on the concentration of HPBI molecules. The coordinative adsorption would result in a new kind of fluorescence emitter. The new fluorescence emitters tend to distribute on the outer surface of ZIF-8 particles periodically. The distance between each fluorescence emitter is fixed and much smaller than the wavelength of the excitation light. Thus, it can be concluded that collective spontaneous emission might be triggered.

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“…At present, two fundamental issues need to be addressed before MOF films can be used as electrolytes in fuel cells, namely how to easily prepare stable films and how to obtain high proton conductivity. The dense thin films are very important to the proton exchange mechanism in fuel cells [16]; the means of preparing dense and electrical conductivity-controlled thin films are studied in this paper [17,18]. MOF-508a (Zn(BDC)(4,4 -bipy) 0.5 DMF(H 2 O) 0.5 with a 3D structure containing a 1D channel (valid pore diameter of 4 × 4 Å) was selected [19]; from this we prepared dense, micron-sized thin films on a Zn substrate via the "twin-zinc-source" method [20,21].…”

Section: Introductionmentioning

confidence: 99%

Thickness and Humidity on Proton Conductivity in MOF-508 Thin Film by Twin-Zinc-Source Method

Zhang,

Wang,

Yang

et al. 2023

Coatings

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To achieve structurally stable and high proton conductive materials, preferably under ambient humidity and pressure, the well-controlled thickness and conductivity of the MOF thin films represent an effective approach. Electrodes are the most important part of fuel cells; proton conducting materials are often used for electrodes, but today high proton conducting materials are expensive and use harsh conditions. Therefore, the goal of researchers is the pursuit of stable structure high proton conductive materials. We prepared well controlled thickness and conductive MOF-508a thin films on a Zn substrate by the “twin zinc source” method, which is very rare in conventional proton conductive materials. The results show that when the thickness of the MOF-508a/Zn thin film was at its minimum (16 µm), the resistivity and proton conductivity reached 2.5 × 103 Ω cm and 4 × 10−4 S cm−1, respectively. The MOF-508b/Zn thin film can absorb water molecules in a high humidity atmosphere and the conductivity decreases significantly with increasing humidity. When the film was put into the atmosphere with a relative humidity of 85%, the resistivity reached 200 Ω cm significantly. This work provides a simple, low cost, and environmentally friendly strategy for fabricating high proton conducting MOF films by exploring the “twin-zinc-source” method, which is critically important for PEMFC. It is believed that higher conductivity MOF films can be obtained with further modifications, indicating the potential of such films as humidity detectors.

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Tuning luminescence of the fluorescent molecule 2-(2-hydroxyphenyl)-1H-benzimidazole via zeolitic imidazolate framework-8

Abstract: ZIF-8 is regarded as a carrier to capture HPBI and eventually the adsorption of the pore structure would saturate, with altering the luminescent intensity. ZIF-8 may be used to sensitively detect nanoscale molecules via changes in fluorescence.

Cited by 4 publications

References 63 publications

Molecular fluorescence significantly enhanced by gold nanoparticles@zeolitic imidazolate framework-8

Molecular fluorescence significantly enhanced by gold nanoparticles@zeolitic imidazolate framework-8

Unraveling the Strong Fluorescence Enhancement of HPBI Molecules by ZIF-8 Colloidal Suspensions via Adsorption Analysis

Thickness and Humidity on Proton Conductivity in MOF-508 Thin Film by Twin-Zinc-Source Method

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