Journal of Photochemistry and Photobiology A-chemistry最新文献

{"title":"Silver ions and bacteria as promoters of UV-A photocatalysis","authors":"Taito Iwabuchi ,&nbsp;Taichi Tenkumo ,&nbsp;Takayuki Mokudai ,&nbsp;Toru Ogawa ,&nbsp;Keiichi Sasaki ,&nbsp;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}

{"title":"Novel sulfonylimide photo-acid generators for deep ultraviolet photoresist with improved acid diffusion inhibition performance through retarding the anion diffusion","authors":"Guangju Liu ,&nbsp;Na Li ,&nbsp;Xiang Gao","doi":"10.1016/j.jphotochem.2025.116279","DOIUrl":"10.1016/j.jphotochem.2025.116279","url":null,"abstract":"<div><div>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).</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116279"},"PeriodicalIF":4.1,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142938","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}

{"title":"Probing structural and luminescence properties of Ce3+ doped MgO nanocrystals via XAS, PL, and TL studies","authors":"Priyanka Bishnoi ,&nbsp;Aditya Sharma ,&nbsp;Ranjeet Brajpuriya ,&nbsp;Keun Hwa Chae ,&nbsp;S.O. Won ,&nbsp;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 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, <em>p</em>-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.</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}

{"title":"Impact of ligand on layered sulfur nanosheets/g-C3N4 nanocomposite for photocatalytic degradation","authors":"Na Liu,&nbsp;Yanwei Su,&nbsp;Siyi Zheng,&nbsp;Yuchen Tang,&nbsp;Chunxia Yu,&nbsp;Yuangang Li,&nbsp;Lihua Shen","doi":"10.1016/j.jphotochem.2025.116274","DOIUrl":"10.1016/j.jphotochem.2025.116274","url":null,"abstract":"<div><div>Sulfur nanosheets (S-NSs), as a novel photocatalyst, was designed to composite with graphite phase nitrogen carbide (g-C₃N₄) to form a kind of new S-NSs/g-C₃N₄ (CNS) photocatalyst. The modulating effect of bovine serum albumin (BSA) or poly (3,4-ethylenedioxythiao)-polystyrene sulfonic acid (PEDOT:PSS) ligands on the photocatalytic activity of CNS nanocomposite was studied. The ligands mainly affect the band gap and conduction band potential of the photocatalyst, leading to different photocatalytic activities. When BSA was used as a ligand, the combine of S-NSs and g-C₃N₄ (CNS-B) cannot improve the photocatalytic activity for the degradation of Rhodamine B (RhB). When PEDOT:PSS was used as a ligand, the composite catalysts of CNS-P significantly improved the photocatalytic activity. The degradation efficiency of composite material CNS-P for RhB and Doxycycline hydrochloride (DOX) can reach 97 % (90 min) and 78 % (90 min). Since the combine of S-NSs and g-C₃N₄, the photoelectric conversion ability was enhanced and the carrier mobility was accelerated. The composite catalyst enhanced the redox ability and suppressed the recombination of photo generated carriers through Z-type charge transfer. This study give a reference for designing a new photocatalysts of two dimensional materials and also provide a potential feasibility for antibiotic degradation application.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116274"},"PeriodicalIF":4.1,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142403","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}

{"title":"Ionic liquid-capped silver-zinc oxide@activated carbon: A Powerful nanocomposite for colorimetric uric acid detection","authors":"Muhammad Asad ,&nbsp;Naeem Khan ,&nbsp;Muslim Khan ,&nbsp;Mohibullah Shah ,&nbsp;Wei Sun ,&nbsp;Xiaoping Zhang ,&nbsp;Riaz Ullah ,&nbsp;Essam A. Ali ,&nbsp;Amir Badshah ,&nbsp;Umar Nishan","doi":"10.1016/j.jphotochem.2025.116273","DOIUrl":"10.1016/j.jphotochem.2025.116273","url":null,"abstract":"<div><div>Abnormal levels of uric acid in the human body lead to several diseases such as gout, diabetes, renal impairment, cardiovascular problems, etc. It is imperative to develop an easy-to-use and low-cost sensing platform. The present work reports on a non-enzymatic colorimetric sensor based on the peroxidase-like activity of ionic liquid-capped silver-zinc oxide-doped activated carbon (IL/Ag-ZnO@AC) for the detection of uric acid. The prepared nanocomposite was characterized by various spectroscopic techniques. The prepared nanozyme catalyzed the oxidation of the chromogenic substrate TMB (3,3′,5,5′-tetramethylbenzidine). Based on the redox chemistry of uric acid, it inhibited the peroxidase-like activity of the proposed nanozyme with a visible colorimetric change. Subsequently, various parameters such as time, pH, H₂O₂, and the amount of the nanozyme as well as TMB were optimized. The proposed assay showed linear detection of uric acid in the range of 0.5–180 μM. Other parameters, such as the limit of detection, limit of quantification, and R² were computed to be 0.13 μM, 0.45 μM, and 0.999, respectively. Alongside its sensitivity, the developed assay was found to be highly selective in the presence of various potential interfering species. The proposed assay was successfully employed for the detection of uric acid in real samples under optimum experimental conditions. The proposed nanozyme has the potential to translate into a useful laboratory tool that can routinely be used for the sensing of uric acid in various diseases.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116273"},"PeriodicalIF":4.1,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142937","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}

{"title":"Blue light-promoted photodegradation of decyl-riboflavin in methanolic solutions","authors":"Carlos A. Ardila Padilla ,&nbsp;M. José Sosa ,&nbsp;María Noel Urrutia ,&nbsp;Andrés H. Thomas ,&nbsp;M. Laura Dántola ,&nbsp;Virginie Lyria Lhiaubet ,&nbsp;Mariana Vignoni","doi":"10.1016/j.jphotochem.2025.116277","DOIUrl":"10.1016/j.jphotochem.2025.116277","url":null,"abstract":"<div><div>The isoalloxazine chromophore of riboflavin (Rf), or vitamin B2, has been exploited over the years for applications in many different areas including photocatalysis, photobiology, photomedicine, etc. We recently reported the biologically relevant features of a <em>N</em>³-alkylated Rf derivative, decyl-Rf, as a lipophilic sensitizer. This compound, which exhibits photophysical and photochemical properties similar to those of the parent isoalloxazine chromophore, induced an exacerbated UVA-photosensitized oxidation of the lipid bilayer. Here, we took advantage of the blue light absorption of decyl-Rf and studied the photochemistry of this lipophilic photosensitizer in non-aqueous solutions after excitation at 445 nm. Air-equilibrated and oxygen-free methanolic solutions of decyl-Rf were irradiated and the photodegradation products were characterized by mass spectrometry. We showed that substitution at <em>N</em>³ position by the decyl carbon chain stabilizes the isoalloxazine core. Indeed, besides the typical Rf photoproducts, lumichrome and lumiflavin derivatives, four photoproducts with a modified ribityl chain, but with intact decyl chain at <em>N</em>³ position and isoalloxazine chromophore, were detected. Therefore, these photoproducts, if formed in biological media, should preserve not only their lipophilicity and interaction with lipid membranes but also their photosensitizing properties.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116277"},"PeriodicalIF":4.1,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142933","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}

{"title":"Facile synthesis of Fe3O4-SiO2-EN@Zn-Al layered double hydroxide nanocomposites for degradation of amoxicillin under solar, visible and UV lights","authors":"Huu-Tap Van ,&nbsp;Mikhail Ivanov ,&nbsp;Razzagh Rahimpoor ,&nbsp;Nezamaddin Mengelizadeh ,&nbsp;Marwah Mohammed hareeja ,&nbsp;Neeti Misra ,&nbsp;Saad Hayif Jasim Ali ,&nbsp;Davoud Balarak","doi":"10.1016/j.jphotochem.2025.116278","DOIUrl":"10.1016/j.jphotochem.2025.116278","url":null,"abstract":"<div><div>Antibiotics, categorized as emerging pollutants, present environmental challenges owing to their harmful and mutation-inducing properties, which hinder their removal. This study seeks to produce Fe₃O₄-SiO₂-EN@Zn-Al layered double hydroxide (FSEZAL) nanocomposites for effectively degrading amoxicillin (AMX) through photocatalysis. The target nanocomposite was prepared using a sol–gel method and subsequently characterized in detail using SEM, XRD, FTIR, BET, PL, and VSM techniques. In this study, scavenger results showed that OH^<img> and O₂^<img>− are both responsible for the AMX degradation. This study also showed that the energy consumed by visible light and UV light during 10–60 min was equal to 44.3 kWh/m³ to 18.5 and 10 to 20.6 kWh/m³, respectively. The reaction rate constant for the photocatalytic process with Fe₃O₄ and SiO₂ nanoparticles, Fe₃O₄-SiO₂-EN, and FSEZAL nanocomposite was 0.0045, 0.0059, 0.0084, and 0.116 1/min, respectively. Also, the half-life constant for nanocomposite was equal to 5.97 min. Ecotoxicity tests were performed using <em>Daphnia magna</em>, and the findings showed a significant reduction in the toxicity of AMX solution. In this study, three types of light were used, and the complete removal of AMX with UV and visible light required 40 min and 60 min, respectively. Also, using sunlight, 87.1 % of AMX was removed within one hour. The reaction rate constants for photocatalytic reactions with UV, visible, and solar lights were 0.116, 0.103, and 0.033 1/min, respectively. Biodegradability and mineralization tests also confirmed the efficacy of the photocatalytic system with synthesized nanocomposite. Therefore, the FSEZAL photocatalysts exhibit promising potential for use in water treatment, particularly in the mitigation of toxicity associated with antibiotic waste.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"462 ","pages":"Article 116278"},"PeriodicalIF":4.1,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166598","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}

{"title":"A Golgi-localized fluorescence probe for measuring cysteine based on a naphthalimide derivative","authors":"Qiujuan Ma ,&nbsp;Junhong Xu ,&nbsp;Shuzhen Liu ,&nbsp;Guojiang Mao ,&nbsp;Shuqi Hou ,&nbsp;Yijie Ma ,&nbsp;Yujie Lian","doi":"10.1016/j.jphotochem.2025.116276","DOIUrl":"10.1016/j.jphotochem.2025.116276","url":null,"abstract":"<div><div>Cysteine is an essential thiol-containing amino acid in biological systems and is involved in several physiological processes in the human body. The Golgi apparatus is the main site of protein processing, and the normal concentration of cysteine is an important factor to maintain the homeostasis in Golgi apparatus. Once the Golgi apparatus homeostasis is disrupted, it will lead to the Golgi apparatus dysfunction, which will lead to a series of diseases. Herein a new Golgi-localized fluorescent probe was constructed for measuring cysteine. The developed probe was assembled by utilizing a 1,8-naphthalimide derivative as the fluorescent component, appending a phenylsulfonamide group to target the Golgi apparatus, and incorporating an acrylate recognition unit to interact with and detect cysteine. Within the concentration range of 2.0 × 10⁻⁷–1.0 × 10⁻⁵ mol·L⁻¹, a favorable linear correlation was observed between the fluorescence intensity of the probe at 550 nm and the cysteine concentration. Furthermore, the detection limit was determined to be 1.56 × 10⁻⁸ mol·L⁻¹. The proposed probe exhibited superior selectivity, swift response time, and wide pH operational scope. In addition, the proposed probe was almost non-cytotoxic and was able to localize to the Golgi apparatus and detect endogenous and exogenous cysteine in A549 cells.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"462 ","pages":"Article 116276"},"PeriodicalIF":4.1,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167324","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}

{"title":"Loading silver nanoclusters onto g-C3N4 by formamide-assisted in-situ strategy to achieve efficient photocatalytic water splitting for hydrogen production","authors":"Zhenbang Xie ,&nbsp;Chao Wang ,&nbsp;Fuqi Wu ,&nbsp;Ruiyuan Hu ,&nbsp;Jie Zhang ,&nbsp;Hongfei Du ,&nbsp;Shouchao Zhang ,&nbsp;Yongzhu Zhou","doi":"10.1016/j.jphotochem.2025.116275","DOIUrl":"10.1016/j.jphotochem.2025.116275","url":null,"abstract":"<div><div>Modification of semiconductor-based photocatalysts with nanoclusters is regarded as a key advancement in photocatalytic hydrogen production. This study successfully prepared g-C₃N₄-based photocatalysts loaded with small-sized silver nanoclusters (Ag NCs/CN) using formamide as a solvent and reducing agent. Through systematic characterization and density functional theory (DFT) calculations, we demonstrate that silver nanoclusters serve as charge-transfer channels, enhancing the generation and separation of photogenerated carriers and optimizing the surface properties of g-C₃N₄ to greatly improve its photocatalytic activity. The photocatalytic hydrogen production rate of Ag NCs/CN reaches 1439.77 μmol·g⁻¹·h⁻¹ significantly surpassing that of g-C₃N₄. Moreover, Ag NCs/CN maintains high photocatalytic activity even after 30 h of continuous cycling. This work reveals the role of silver nanocluster modification in photogenerated electron separation and transport, providing new insights into the application of metal nanocluster composite catalysts.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"462 ","pages":"Article 116275"},"PeriodicalIF":4.1,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166594","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}

{"title":"Elucidation of the dynamic quenching behavior of pyridinium porphyrin derivatives on clay nanosheet","authors":"Yiming Li ,&nbsp;Yugo Hirade ,&nbsp;Tamao Ishida ,&nbsp;Tetsuya Shimada ,&nbsp;Shinsuke Takagi","doi":"10.1016/j.jphotochem.2025.116266","DOIUrl":"10.1016/j.jphotochem.2025.116266","url":null,"abstract":"<div><div>In this study, we investigated the adsorption and photophysical behaviors of <em>meso</em>-tetra(<em>N</em>-methyl-4-pyridyl)porphyrin (<em>m</em>-TMPyP) and <em>meso</em>-tetra(<em>N</em>-butyl-4-pyridyl)porphyrin (<em>m</em>-TBPyP) molecules on the surface of a synthetic silicate nanosheet. The <em>λ</em>_max of <em>m</em>-TMPyP and <em>m</em>-TBPyP on the synthetic clay nanosheet were 429 and 440 nm under the non-aggregation state, respectively. The spectroscopic analysis revealed that a flattening of the molecular structure of <em>m</em>-TBPyP upon adsorption is stronger than <em>m</em>-TMPyP. Compared to <em>m</em>-TMPyP, the fluorescence quenching of <em>m</em>-TBPyP was suppressed to some extent, especially at adsorption densities below 30 % <em>vs</em>. cation exchange capacity of the nanosheet, due to the steric effects of its longer alkyl chain reducing molecular contact. However, <em>m</em>-TBPyP suffered a 10 % self-fluorescence quenching rate at saturation adsorption as same as the case of <em>m</em>-TMPyP. Interestingly, mixing two dyes in a 1:1 ratio suppressed self-fluorescence quenching even at saturation adsorption. This indicates that the neighboring of same porphyrin, leading to the quenching, was suppressed in the mixture system. Thus, the arrangement of <em>m</em>-TMPyP and <em>m</em>-TBPyP is uniform and prevents molecular collisions between same species. The uniform arrangement and no-fluorescence quenching of <em>m</em>-TMPyP (energy donor) and <em>m</em>-TBPyP (acceptor) on clay nanosheet could facilitate efficient photochemical energy transfer between them. As a result, by suppressing self-fluorescence quenching, the efficient energy transfer between <em>m</em>-TMPyP and <em>m</em>-TBPyP was observed. It was determined that the energy transfer efficiency (<em>η</em>_ET) is 85 %, with a self-fluorescence quenching efficiency (<em>ϕ</em>_q) of 0 %. These findings are beneficial to design more efficient systems for artificial light-harvesting systems by optimizing molecular interactions on clay surfaces.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116266"},"PeriodicalIF":4.1,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142924","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}