Journal of Photochemistry and Photobiology A-chemistry最新文献

英文中文

Nanoshell-mediated color tuning of erbium-sensitized upconversion nanoparticles for advanced phototherapy above 1500 nm

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry

Pub Date : 2025-01-23 DOI: 10.1016/j.jphotochem.2025.116285

Tonghan Zhao , Dengke Song , Jing Wang , Huadong Chen, Wenqian Chen, Xiaohui Zhu

Conventional phototherapy, including photodynamic therapy (PDT) and photothermal therapy (PTT), is often limited by the risk of serious photodamage and shallow tissue caused by the excitation light. Lanthanide-doped upconversion nanoparticles (UCNPs) enable to convert long-wavelength light to short-wavelength emission, which, in principle, can address these issues in phototherapy. However, traditional UCNPs are mainly excitable in the near-infrared I region (700–900 nm), which still faces challenges such as strong light absorption/scattering and overheating side effects. Herein, we have developed an Er³⁺-sensitized upconversion nanoparticle (NaErF₄@NaYbF₄@NaYF₄) in response to 1550 nm excitation light in the far NIR-II region. Through a core–shell–shell engineering strategy, the emissive signal of Er³⁺ ion can be finely tailored from red-dominant to green-dominant, offering great flexibility in optical tuning of Er³⁺ sensitized UCNPs under 1550 nm light excitation. Upon surface modification by a mesoporous silica shell and loading of dual photosensitive agents (MC540 (merocyanine 540) and FePc (iron phthalocyanine)), a synergistic PDT/PTT phototherapeutic nanoagent was constructed. Results showed that as-developed nanotherapeutic platform could solve the overheating problem and further enhance tissue penetration upon illumination by 1550 nm light, thus demonstrating great efficiency of combinational PDT/PTT for tumor treatment.

{"title":"Nanoshell-mediated color tuning of erbium-sensitized upconversion nanoparticles for advanced phototherapy above 1500 nm","authors":"Tonghan Zhao , Dengke Song , Jing Wang , Huadong Chen, Wenqian Chen, Xiaohui Zhu","doi":"10.1016/j.jphotochem.2025.116285","DOIUrl":"10.1016/j.jphotochem.2025.116285","url":null,"abstract":"<div><div>Conventional phototherapy, including photodynamic therapy (PDT) and photothermal therapy (PTT), is often limited by the risk of serious photodamage and shallow tissue caused by the excitation light. Lanthanide-doped upconversion nanoparticles (UCNPs) enable to convert long-wavelength light to short-wavelength emission, which, in principle, can address these issues in phototherapy. However, traditional UCNPs are mainly excitable in the near-infrared I region (700–900 nm), which still faces challenges such as strong light absorption/scattering and overheating side effects. Herein, we have developed an Er<sup>3+</sup>-sensitized upconversion nanoparticle (NaErF<sub>4</sub>@NaYbF<sub>4</sub>@NaYF<sub>4</sub>) in response to 1550 nm excitation light in the far NIR-II region. Through a core–shell–shell engineering strategy, the emissive signal of Er<sup>3+</sup> ion can be finely tailored from red-dominant to green-dominant, offering great flexibility in optical tuning of Er<sup>3+</sup> sensitized UCNPs under 1550 nm light excitation. Upon surface modification by a mesoporous silica shell and loading of dual photosensitive agents (MC540 (merocyanine 540) and FePc (iron phthalocyanine)), a synergistic PDT/PTT phototherapeutic nanoagent was constructed. Results showed that as-developed nanotherapeutic platform could solve the overheating problem and further enhance tissue penetration upon illumination by 1550 nm light, thus demonstrating great efficiency of combinational PDT/PTT for tumor treatment.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116285"},"PeriodicalIF":4.1,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fluorescent tetrazolylpyrene unnatural nucleoside in sensing BSA protein

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry

Pub Date : 2025-01-22 DOI: 10.1016/j.jphotochem.2025.116290

Subhendu Sekhar Bag , Hiranya Gogoi , Sujata Roy , Manoj Kumar Pradhan , Sangita Talukdar

A spectroscopic investigation of the interaction of a fluorescent unnatural tetrazolylpyrene nucleoside (^TPyB_Do) with model protein BSA is presented herein. The probe nucleoside shows a good interaction with BSA, which is reflected by the enhanced fluorescence intensity with an increase in the concentration of BSA. The enhancement is found to be linear with respect to the BSA concentration. Thus, the probe might find applications in chemical biology. The results infer that exploiting weak non-covalent interactions, such as H-bonding/hydrophobic, is an efficient strategy for sensing biomolecules. Further, the result would also help in designing other novel fluorescent probes capable of interacting with biomolecules via such forces with the generation of enhanced signals.

引用次数: 0

Synthesis of novel Ce3+ doped NaLi2PO4 UV-A emitting phosphor

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry

Pub Date : 2025-01-22 DOI: 10.1016/j.jphotochem.2025.116289

Sanjeev Kumar , Manveer Singh , Siddhartha , Kuldeep Kumar , Bhawani Shankar , Nimmi Singh

Ce³⁺ doped NaLi₂PO₄ orthophosphate material was successfully synthesized via the solid-state diffusion method. The phase purity of synthesized phosphor was confirmed by Powder X-ray Diffraction (PXRD). Elemental analysis and surface morphology of phosphor material were analyzed by Field Emission Scanning Electron Microscope (FE-SEM) and Energy Dispersive X-Ray Spectroscopy (EDX) respectively. In addition, chemical states and their elemental bonding of material were investigated by X-ray Photoelectron Spectroscopy (XPS). Whereas Diffuse Reflectance Spectra (DRS) is utilized to examine the optical energy band gap of NaLi₂PO₄ and NaLi₂PO₄:Ce³⁺ phosphors. First principle study was employed to explain the energy band gap deviation between the theoretical and experimental results of phosphors. Fluorescence properties of NaLi₂PO₄:Ce³⁺ phosphor (0.0 to 0.3 mol %) were studied at excitation wavelength of 277 nm. NaLi₂PO₄:Ce³⁺phosphor exhibited intense emission peaks centred at 335 and 360 nm due to spin orbit splitting of ²F_5/2 and ²F_7/2. Beyond the optimal limit of dopant ions, non-radiative energy transfer phenomena occurred due to dipole–dipole interaction between the acceptor and the donor. Minimum stokes shift between the excitation and emission bands of phosphor leads it to persistent UV emission. These properties of NaLi₂PO₄:Ce³⁺ phosphor predicts its possible use in the development of UV-A phosphor LEDs.

{"title":"Synthesis of novel Ce3+ doped NaLi2PO4 UV-A emitting phosphor","authors":"Sanjeev Kumar , Manveer Singh , Siddhartha , Kuldeep Kumar , Bhawani Shankar , Nimmi Singh","doi":"10.1016/j.jphotochem.2025.116289","DOIUrl":"10.1016/j.jphotochem.2025.116289","url":null,"abstract":"<div><div>Ce<sup>3+</sup> doped NaLi<sub>2</sub>PO<sub>4</sub> orthophosphate material was successfully synthesized via the solid-state diffusion method. The phase purity of synthesized phosphor was confirmed by Powder X-ray Diffraction (PXRD). Elemental analysis and surface morphology of phosphor material were analyzed by Field Emission Scanning Electron Microscope (FE-SEM) and Energy Dispersive X-Ray Spectroscopy (EDX) respectively. In addition, chemical states and their elemental bonding of material were investigated by X-ray Photoelectron Spectroscopy (XPS). Whereas Diffuse Reflectance Spectra (DRS) is utilized to examine the optical energy band gap of NaLi<sub>2</sub>PO<sub>4</sub> and NaLi<sub>2</sub>PO<sub>4</sub>:Ce<sup>3+</sup> phosphors. First principle study was employed to explain the energy band gap deviation between the theoretical and experimental results of phosphors. Fluorescence properties of NaLi<sub>2</sub>PO<sub>4</sub>:Ce<sup>3+</sup> phosphor (0.0 to 0.3 mol %) were studied at excitation wavelength of 277 nm. NaLi<sub>2</sub>PO<sub>4</sub>:Ce<sup>3+</sup>phosphor exhibited intense emission peaks centred at 335 and 360 nm due to spin orbit splitting of <sup>2</sup>F<sub>5/2</sub> and <sup>2</sup>F<sub>7/2</sub>. Beyond the optimal limit of dopant ions, non-radiative energy transfer phenomena occurred due to dipole–dipole interaction between the acceptor and the donor. Minimum stokes shift between the excitation and emission bands of phosphor leads it to persistent UV emission. These properties of NaLi<sub>2</sub>PO<sub>4</sub>:Ce<sup>3+</sup> phosphor predicts its possible use in the development of UV-A phosphor LEDs.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116289"},"PeriodicalIF":4.1,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of red carbon quantum dots with solvatochromic properties as a selective luminescence probe of MnO4−

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry

Pub Date : 2025-01-21 DOI: 10.1016/j.jphotochem.2025.116288

Wen-Xin Chu , Xiao-Min Tang , Fei-Yang Lu , Bao-Li An , Ji-Ming Zhang , Xiao-Hong Wang , Yue-Ling Bai , Jiaqiang Xu

Red efficient luminescent carbon quantum dots are still difficult to be synthesized. In this work, red carbon quantum dots (RCQDs) isopropanol solution with quantum yield of 43.9 % have been synthesized using isopropanol as carbon source and solvent, N1-phenylbenzene-1,2,4-triamine as carbon and nitrogen source. The solvothermal synthesis was catalyzed surprisingly by SnO₂ nanoparticles, the optimal synthesis temperature was lowered to 130 °C, and the optimal synthesis time was reduced to 1 h. Moreover, the RCQDs nanoparticles showed excellent solvatochromic properties. The maximum emission wavelength for RCQDs in N, N-dimethylformamide dilute solution blue shifted to 504 nm, and the maximum emission wavelengths for RCQDs in acetone, isopropanol, dimethyl sulfoxide and water solutions were in the range of 592 nm ∼ 624 nm. The reason was investigated by the in-situ infrared absorption spectra. MnO₄⁻ ions could be selectively detected using RCQDs in PBS buffer solution (pH = 5.0), the linear range of MnO₄⁻ concentration was 0.1 μM ∼ 2.0 μM. This work provides a new synthesis method of efficient red carbon quantum dots, and it supplies a friendly candidate for detection of MnO₄⁻ ions in water.

{"title":"Synthesis of red carbon quantum dots with solvatochromic properties as a selective luminescence probe of MnO4−","authors":"Wen-Xin Chu , Xiao-Min Tang , Fei-Yang Lu , Bao-Li An , Ji-Ming Zhang , Xiao-Hong Wang , Yue-Ling Bai , Jiaqiang Xu","doi":"10.1016/j.jphotochem.2025.116288","DOIUrl":"10.1016/j.jphotochem.2025.116288","url":null,"abstract":"<div><div>Red efficient luminescent carbon quantum dots are still difficult to be synthesized. In this work, red carbon quantum dots (RCQDs) isopropanol solution with quantum yield of 43.9 % have been synthesized using isopropanol as carbon source and solvent, N1-phenylbenzene-1,2,4-triamine as carbon and nitrogen source. The solvothermal synthesis was catalyzed surprisingly by SnO<sub>2</sub> nanoparticles, the optimal synthesis temperature was lowered to 130 °C, and the optimal synthesis time was reduced to 1 h. Moreover, the RCQDs nanoparticles showed excellent solvatochromic properties. The maximum emission wavelength for RCQDs in <em>N</em>, <em>N</em>-dimethylformamide dilute solution blue shifted to 504 nm, and the maximum emission wavelengths for RCQDs in acetone, isopropanol, dimethyl sulfoxide and water solutions were in the range of 592 nm ∼ 624 nm. The reason was investigated by the in-situ infrared absorption spectra. MnO<sub>4</sub><sup>−</sup> ions could be selectively detected using RCQDs in PBS buffer solution (pH = 5.0), the linear range of MnO<sub>4</sub><sup>−</sup> concentration was 0.1 μM ∼ 2.0 μM. This work provides a new synthesis method of efficient red carbon quantum dots, and it supplies a friendly candidate for detection of MnO<sub>4</sub><sup>−</sup> ions in water.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116288"},"PeriodicalIF":4.1,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced fluorescence resonance energy transfer in CsPbBr3 quantum dot-rhodamine 640 molecule hybrid system: Toward high-efficiency and high-rate capability

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry

Pub Date : 2025-01-21 DOI: 10.1016/j.jphotochem.2025.116283

Bo Li , Yongfeng Wan , Caifeng Xiu , Yuliang Liu , Qi Li , Lixia Zhu , Hang Yin , Ying Shi

The fluorescence resonance energy transfer (FRET) process plays a crucial role in improving the efficiency of optoelectronic and photosynthetic devices. CsPbBr₃ perovskite quantum dot (QD) serves as efficient photon absorbers and exciton generators, thus offering the potential to enhance FRET performance. However, a high-efficiency FRET process with high-rate capability has not been achieved in the CsPbBr₃ perovskite QD-based system. Herein, we reported that the FRET process is improved in CsPbBr₃ perovskite QD-rhodamine 640 molecule hybrid system in n-hexane solution. This phenomenon stems from an increased number of adsorbed acceptor and a decreased distance between donor and acceptor. When the adsorbed number reached 4.2, a near-unity FRET efficiency of 99.3 % was achieved. Meanwhile, femtosecond transient absorption spectroscopy reveals that the FRET process exhibits a high-rate capability of 0.57 ps⁻¹. Consequently, this research will stimulate the development of high-performance light-emitting device of perovskite-based system.

{"title":"Enhanced fluorescence resonance energy transfer in CsPbBr3 quantum dot-rhodamine 640 molecule hybrid system: Toward high-efficiency and high-rate capability","authors":"Bo Li , Yongfeng Wan , Caifeng Xiu , Yuliang Liu , Qi Li , Lixia Zhu , Hang Yin , Ying Shi","doi":"10.1016/j.jphotochem.2025.116283","DOIUrl":"10.1016/j.jphotochem.2025.116283","url":null,"abstract":"<div><div>The fluorescence resonance energy transfer (FRET) process plays a crucial role in improving the efficiency of optoelectronic and photosynthetic devices. CsPbBr<sub>3</sub> perovskite quantum dot (QD) serves as efficient photon absorbers and exciton generators, thus offering the potential to enhance FRET performance. However, a high-efficiency FRET process with high-rate capability has not been achieved in the CsPbBr<sub>3</sub> perovskite QD-based system. Herein, we reported that the FRET process is improved in CsPbBr<sub>3</sub> perovskite QD-rhodamine 640 molecule hybrid system in n-hexane solution. This phenomenon stems from an increased number of adsorbed acceptor and a decreased distance between donor and acceptor. When the adsorbed number reached 4.2, a near-unity FRET efficiency of 99.3 % was achieved. Meanwhile, femtosecond transient absorption spectroscopy reveals that the FRET process exhibits a high-rate capability of 0.57 ps<sup>−1</sup>. Consequently, this research will stimulate the development of high-performance light-emitting device of perovskite-based system.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116283"},"PeriodicalIF":4.1,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New pyrazoline-imidazole derivatives as highly fluorescent small organic compounds: Synthesis, photoluminescence properties, and DFT/TD-DFT calculations

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry

Pub Date : 2025-01-20 DOI: 10.1016/j.jphotochem.2025.116272

Mohamed I. Chouiter , Yunsheng Xue , Ali Belfaitah , Gilles Ulrich , Houssem Boulebd

In this paper we present the synthesis, photoluminescence properties and quantum chemical calculations of a series of novel 1,3,5-trisubstituted 2-pyrazoline derivatives incorporating an imidazole nucleus. These compounds were synthesized in good to excellent yields through the reaction of α,β-unsaturated ketones (chalcones) with phenylhydrazine derivatives. Structural elucidation of all synthesized compounds was performed using spectroscopic techniques including IR, ¹H NMR, ¹³C NMR, and HR-MS. The photoluminescence properties of the pyrazolines were evaluated using UV–visible absorption and fluorescence spectroscopy. These compounds exhibited strong fluorescence in liquid solution, with fluorescence lifetimes ranging from 3.2 ns to 4.3 ns and quantum yields between 50 % and 74 %. The absorption spectra of the compounds revealed peaks in the near-ultraviolet region (325 to 364 nm), while the emission spectra displayed wavelengths in the blue region (434 to 476 nm). Additionally, density functional theory (DFT) and time-dependent density functional theory (TD-DFT) calculations, performed at the PBE0/TZVP level of theory, provided insight into the mechanisms underlying the fluorescence properties of the synthesized molecules.

{"title":"New pyrazoline-imidazole derivatives as highly fluorescent small organic compounds: Synthesis, photoluminescence properties, and DFT/TD-DFT calculations","authors":"Mohamed I. Chouiter , Yunsheng Xue , Ali Belfaitah , Gilles Ulrich , Houssem Boulebd","doi":"10.1016/j.jphotochem.2025.116272","DOIUrl":"10.1016/j.jphotochem.2025.116272","url":null,"abstract":"<div><div>In this paper we present the synthesis, photoluminescence properties and quantum chemical calculations of a series of novel 1,3,5-trisubstituted 2-pyrazoline derivatives incorporating an imidazole nucleus. These compounds were synthesized in good to excellent yields through the reaction of α,β-unsaturated ketones (chalcones) with phenylhydrazine derivatives. Structural elucidation of all synthesized compounds was performed using spectroscopic techniques including IR, <sup>1</sup>H NMR, <sup>13</sup>C NMR, and HR-MS. The photoluminescence properties of the pyrazolines were evaluated using UV–visible absorption and fluorescence spectroscopy. These compounds exhibited strong fluorescence in liquid solution, with fluorescence lifetimes ranging from 3.2 ns to 4.3 ns and quantum yields between 50 % and 74 %. The absorption spectra of the compounds revealed peaks in the near-ultraviolet region (325 to 364 nm), while the emission spectra displayed wavelengths in the blue region (434 to 476 nm). Additionally, density functional theory (DFT) and time-dependent density functional theory (TD-DFT) calculations, performed at the PBE0/TZVP level of theory, provided insight into the mechanisms underlying the fluorescence properties of the synthesized molecules.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116272"},"PeriodicalIF":4.1,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Maltose-functionalized MAPbBr3 fluorescent perovskite quantum dots with strong water resistance for detection of γ-aminobutyric acid as a neurological biomarker

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry

Pub Date : 2025-01-20 DOI: 10.1016/j.jphotochem.2025.116282

Suresh Kumar Kailasa , Mayurkumar Revabhai Patel , Madhura Pradeep Deshpande , Eunji Shin , Yoojin Choi , Tae Jung Park

Zero-dimensional perovskite nanostructures have always been shown outstanding applications in recognizing gases and molecular species. Herein, maltose (Malt) was introduced as an encapsulating agent for the synthesis of MAPbBr₃ fluorescent perovskite quantum dots (Malt@MAPbBr₃ PQDs), showing strong water resistance and good quantum yield (QY). The as-synthesized Malt@MAPbBr₃ PQDs have an average size of 7.25 ± 2.63 nm. The structure and elemental composition of Malt@MAPbBr₃ PQDs are confirmed by various analytical techniques. The as-synthesized Malt@MAPbBr₃ PQDs display remarkable fluorescence characteristics (λ_Ex/Em = 430/535 nm) with QY of 23.74 %. The selectivity of various biomarkers (epinephrine, normetanephrine, creatinine, dehydroepiandrosterone, uric acid, bilirubin, methyl nicotinate, γ-aminobutyric acid (GABA), Se-methylselenocystiene, and cortisone) on the fluorescence quenching of Malt@MAPbBr₃ PQDs was studied through fluorescence emission spectroscopy. Interestingly, Malt@MAPbBr₃ PQDs exhibit a noticeable fluorescence quenching (>90 %) with the limit of detection (8.37 nM) in the presence of GABA. The developed Malt@MAPbBr₃ PQDs-based fluorescent sensor is successfully applied to detect GABA in biofluids.

{"title":"Maltose-functionalized MAPbBr3 fluorescent perovskite quantum dots with strong water resistance for detection of γ-aminobutyric acid as a neurological biomarker","authors":"Suresh Kumar Kailasa , Mayurkumar Revabhai Patel , Madhura Pradeep Deshpande , Eunji Shin , Yoojin Choi , Tae Jung Park","doi":"10.1016/j.jphotochem.2025.116282","DOIUrl":"10.1016/j.jphotochem.2025.116282","url":null,"abstract":"<div><div>Zero-dimensional perovskite nanostructures have always been shown outstanding applications in recognizing gases and molecular species. Herein, maltose (Malt) was introduced as an encapsulating agent for the synthesis of MAPbBr<sub>3</sub> fluorescent perovskite quantum dots (Malt@MAPbBr<sub>3</sub> PQDs), showing strong water resistance and good quantum yield (QY). The as-synthesized Malt@MAPbBr<sub>3</sub> PQDs have an average size of 7.25 ± 2.63 nm. The structure and elemental composition of Malt@MAPbBr<sub>3</sub> PQDs are confirmed by various analytical techniques. The as-synthesized Malt@MAPbBr<sub>3</sub> PQDs display remarkable fluorescence characteristics (λ<sub>Ex/Em</sub> = 430/535 nm) with QY of 23.74 %. The selectivity of various biomarkers (epinephrine, normetanephrine, creatinine, dehydroepiandrosterone, uric acid, bilirubin, methyl nicotinate, γ-aminobutyric acid (GABA), Se-methylselenocystiene, and cortisone) on the fluorescence quenching of Malt@MAPbBr<sub>3</sub> PQDs was studied through fluorescence emission spectroscopy. Interestingly, Malt@MAPbBr<sub>3</sub> PQDs exhibit a noticeable fluorescence quenching (>90 %) with the limit of detection (8.37 nM) in the presence of GABA. The developed Malt@MAPbBr<sub>3</sub> PQDs-based fluorescent sensor is successfully applied to detect GABA in biofluids.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116282"},"PeriodicalIF":4.1,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Silver ions and bacteria as promoters of UV-A photocatalysis

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry

Pub Date : 2025-01-20 DOI: 10.1016/j.jphotochem.2025.116269

Taito Iwabuchi , Taichi Tenkumo , Takayuki Mokudai , Toru Ogawa , Keiichi Sasaki , Nobuhiro Yoda

Aim

This study aimed to identify the ions used in disinfection treatments involving UV-A irradiation and to clarify the mechanism of free radical generation in three combinations of silver ions, Staphylococcus aureus, and UV-A irradiation, for applications in dental implants.

Methods

Free radicals were analyzed 1 or 4 min after combining various ions (Na, Mg, Al, Ca, Fe, Cu, Zn, Ag, Pt, or Au) with S. aureus, followed by UV-A irradiation. The mechanism of free radical generation from the UV-A irradiation of a mixture of Ag and S. aureus was examined using electron spin resonance (ESR), nuclear magnetic resonance (NMR), X-ray diffraction, and GSH/GSSG ELISA assays.

Results

Free radicals were generated from combinations of Na, Mg, Al, Ca, Zn, and Ag ions under UV-A irradiation in bacterial suspensions, with Ag producing the highest yield among all ions. Additionally, the mixture of Fe ions and bacterial suspension generated DMPO-SG. The combination of Ag ions and UV-A irradiation in bacterial suspensions resulted in the production of hydroxyl radicals. Free radicals were also generated from all cellular fractions upon UV-A irradiation in the presence of silver, with a higher yield observed in lipopolysaccharide and peptidoglycan. The combination of silver ions and UV-A irradiation oxidized GSH to GSSG, producing thiol radicals.

Conclusion

Silver ions in bacteria act as promoters of UV-A photocatalysis.

{"title":"Silver ions and bacteria as promoters of UV-A photocatalysis","authors":"Taito Iwabuchi , Taichi Tenkumo , Takayuki Mokudai , Toru Ogawa , Keiichi Sasaki , Nobuhiro Yoda","doi":"10.1016/j.jphotochem.2025.116269","DOIUrl":"10.1016/j.jphotochem.2025.116269","url":null,"abstract":"<div><h3>Aim</h3><div>This study aimed to identify the ions used in disinfection treatments involving UV-A irradiation and to clarify the mechanism of free radical generation in three combinations of silver ions, <em>Staphylococcus aureus</em>, and UV-A irradiation, for applications in dental implants.</div></div><div><h3>Methods</h3><div>Free radicals were analyzed 1 or 4 min after combining various ions (Na, Mg, Al, Ca, Fe, Cu, Zn, Ag, Pt, or Au) with <em>S. aureus,</em> followed by UV-A irradiation. The mechanism of free radical generation from the UV-A irradiation of a mixture of Ag and <em>S. aureus</em> was examined using electron spin resonance (ESR), nuclear magnetic resonance (NMR), X-ray diffraction, and GSH/GSSG ELISA assays.</div></div><div><h3>Results</h3><div>Free radicals were generated from combinations of Na, Mg, Al, Ca, Zn, and Ag ions under UV-A irradiation in bacterial suspensions, with Ag producing the highest yield among all ions. Additionally, the mixture of Fe ions and bacterial suspension generated DMPO-SG. The combination of Ag ions and UV-A irradiation in bacterial suspensions resulted in the production of hydroxyl radicals. Free radicals were also generated from all cellular fractions upon UV-A irradiation in the presence of silver, with a higher yield observed in lipopolysaccharide and peptidoglycan. The combination of silver ions and UV-A irradiation oxidized GSH to GSSG, producing thiol radicals.</div></div><div><h3>Conclusion</h3><div>Silver ions in bacteria act as promoters of UV-A photocatalysis.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116269"},"PeriodicalIF":4.1,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Novel sulfonylimide photo-acid generators for deep ultraviolet photoresist with improved acid diffusion inhibition performance through retarding the anion diffusion

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry

Pub Date : 2025-01-20 DOI: 10.1016/j.jphotochem.2025.116279

Guangju Liu , Na Li , Xiang Gao

A series of novel ionic photo-acid generators (PAGs) useful in chemically amplified photoresist formulations has been developed, which are salts comprising a photoactive triphenyl cation and a sulfonylimide anion containing an aromatic group. A styrene-based polymer resin is prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization and blended with the novel PAGs as deep ultraviolet (DUV) photoresists. Furthermore, one of the novel PAGs is used as a monomer to be bound into the polymer resin through RAFT polymerization to obtain a photoresist-PAG copolymer. The prepared photoresists are exposed by a DUV light to study their sensitivity, acid diffusion length, and lithography pattern profile. The results show that both the photoresists blended with the novel PAGs and the photoresist-PAG copolymer exhibit good resistance to acid diffusion and low line sidewall roughness (LSR).

引用次数: 0

Probing structural and luminescence properties of Ce3+ doped MgO nanocrystals via XAS, PL, and TL studies

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry

Pub Date : 2025-01-20 DOI: 10.1016/j.jphotochem.2025.116281

Priyanka Bishnoi , Aditya Sharma , Ranjeet Brajpuriya , Keun Hwa Chae , S.O. Won , Ankush Vij

MgO:Ce and MgO:CeLi nanocrystals have been prepared using the solution combustion method and investigated for structural, electronic structure, photoluminescence, and thermoluminescence properties. X-ray diffraction (XRD) analysis revealed the single-phase formation of MgO:Ce amd MgO:CeLi compounds up to 0.1 mol% of Ce doping. The formation of CeO₂ phase has been observed at 2 mol% Ce doping in MgO. Low energy shift in the Mg K-edge X-ray absorption near edge structure (XANES) spectra conveys favorable tetrahedral site occupancy of Mg²⁺ ions in MgO:Ce nanocrystals. The enhanced intensity of the O K-edge XANES feature, in MgO:Ce samples, reveals a more, p-projected, unoccupied density of states and significant hybridization of Ce 4f and O 2p states. Ce L₃ edge XANES spectra confirmed the coexistence of Ce⁴⁺ and Ce³⁺ ions in the samples. Photoluminescence (PL) experiments, conducted with UV LED excitation at 275 nm and 310 nm, showed emissions in two regions; a blue region centered at 430 nm and a red region at 670 nm in pure MgO. Additionally, distinct emission bands corresponding to Ce 5d-4f transitions were observed and the Li co-doping could enhance the PL intensity. Thermoluminescence (TL) studies of the samples were conducted after being exposed to the different doses (100 Gy, 500 Gy, 1 kGy) of gamma radiation. The deconvolution of TL peaks has confirmed the presence of multiple traps. Kinetic parameters of TL glow peaks revealed re-trapping and closely spaced traps within the forbidden band gap. The stability and linear behavior of TL peaks demonstrated the excellent dosimetry characteristics of prepared MgO: CeLi nano phosphors.

{"title":"Probing structural and luminescence properties of Ce3+ doped MgO nanocrystals via XAS, PL, and TL studies","authors":"Priyanka Bishnoi , Aditya Sharma , Ranjeet Brajpuriya , Keun Hwa Chae , S.O. Won , Ankush Vij","doi":"10.1016/j.jphotochem.2025.116281","DOIUrl":"10.1016/j.jphotochem.2025.116281","url":null,"abstract":"<div><div>MgO:Ce and MgO:CeLi nanocrystals have been prepared using the solution combustion method and investigated for structural, electronic structure, photoluminescence, and thermoluminescence properties. X-ray diffraction (XRD) analysis revealed the single-phase formation of MgO:Ce amd MgO:CeLi compounds up to 0.1 mol% of Ce doping. The formation of CeO<sub>2</sub> phase has been observed at 2 mol% Ce doping in MgO. Low energy shift in the Mg K-edge X-ray absorption near edge structure (XANES) spectra conveys favorable tetrahedral site occupancy of Mg<sup>2+</sup> ions in MgO:Ce nanocrystals. The enhanced intensity of the O K-edge XANES feature, in MgO:Ce samples, reveals a more, <em>p</em>-projected, unoccupied density of states and significant hybridization of Ce 4f and O 2p states. Ce L<sub>3</sub> edge XANES spectra confirmed the coexistence of Ce<sup>4+</sup> and Ce<sup>3+</sup> ions in the samples. Photoluminescence (PL) experiments, conducted with UV LED excitation at 275 nm and 310 nm, showed emissions in two regions; a blue region centered at 430 nm and a red region at 670 nm in pure MgO. Additionally, distinct emission bands corresponding to Ce 5d-4f transitions were observed and the Li co-doping could enhance the PL intensity. Thermoluminescence (TL) studies of the samples were conducted after being exposed to the different doses (100 Gy, 500 Gy, 1 kGy) of gamma radiation. The deconvolution of TL peaks has confirmed the presence of multiple traps. Kinetic parameters of TL glow peaks revealed re-trapping and closely spaced traps within the forbidden band gap. The stability and linear behavior of TL peaks demonstrated the excellent dosimetry characteristics of prepared MgO: CeLi nano phosphors.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116281"},"PeriodicalIF":4.1,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

首页上一页

下一页尾页

类型

全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

数据库

全部 ACS Publications Elsevier ieeexplore Springer The Royal Society of Chemistry Wiley

期刊

Journal of Photochemistry and Photobiology A-chemistry

全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.

﹀