Photochem Pub Date : 2024-07-14 DOI: 10.3390/photochem4030018

María Ángeles Cortés, Carlos Díaz, R. de la Campa, A. Presa-Soto, María Luisa Valenzuela

{"title":"Synthesis of Metallic and Metal Oxide Nanoparticles Using Homopolymers as Solid Templates: Luminescent Properties of the Eu+3 Nanoparticle Products","authors":"María Ángeles Cortés, Carlos Díaz, R. de la Campa, A. Presa-Soto, María Luisa Valenzuela","doi":"10.3390/photochem4030018","DOIUrl":"https://doi.org/10.3390/photochem4030018","url":null,"abstract":"Starting from poly(4-vinylpyridine) ((P4VP)n), poly(2-vinylpyridine) ((P2VP)n), and [N=P(O2CH2CF3)]m-b-P2VP20 block copolymers, a series of metal-containing homopolymers, (P4VP)n⊕MXm, (P2VP)n⊕MXm, and [N=P(O2CH2CF3)]m-b-P2VP20]⊕MXm MXm = PtCl2, ZnCl2, and Eu(NO3)3, have been successfully prepared by using a direct and simple solution methodology. Solid-state pyrolysis of the prepared metal-containing polymeric precursors led to the formation of a variety of different metallic and metal oxide nanoparticles (Pt, ZnO, Eu2O3, and EuPO4) depending on the composition and nature of the polymeric template precursor. Thus, whereas Eu2O3 nanostructures were obtained from europium-containing homopolymers ((P4VP)n⊕MXm and (P2VP)n⊕MXm), EuPO4 nanostructures were achieved using phosphorus-containing block copolymer precursors, [N=P(O2CH2CF3)]m-b-P2VP20]⊕MXm with MXm = Eu(NO3)3. Importantly, and although both Eu2O3 and EuPO4 nanostructures exhibited a strong luminescence emission, these were strongly influenced by the nature and composition of the macromolecular metal-containing polymer template. Thus, for P2VP europium-containing homopolymers ((P4VP)n⊕MXm and (P2VP)n⊕MXm), the highest emission intensity corresponded to the lowest-molecular-weight homopolymer template, [P4VP(Eu(NO3)3]6000, whereas the opposite behavior was observed when block copolymer precursors, [N=P(O2CH2CF3)]m-b-P2VP20]⊕MXm MXm= Eu(NO3)3, were used (highest emission intensity corresponded to [N=P(O2CH2CF3)]100-b-[P2VP(Eu(NO3)3)x]20). The intensity ratio of the emission transitions: 5D0 → 7F2/5D0 → 7F1, suggested a different symmetry around the Eu3+ ions depending on the nature of the polymeric precursor, which also influenced the sizes of the prepared Pt°, ZnO, Eu2O3, and EuPO4 nanostructures.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141649994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Facile Doping of 2,2,2-Trifluoroethanol to Single-Walled Carbon Nanotubes Electrodes for Durable Perovskite Solar Cells 将 2,2,2-三氟乙醇轻松掺杂到单壁碳纳米管电极中以实现持久的 Perovskite 太阳能电池

Photochem Pub Date : 2024-07-14 DOI: 10.3390/photochem4030019

Naoki Ueoka, Achmad Syarif Hidayat, Hisayoshi Oshima, Yoshimasa Hijikata, Yutaka Matsuo

{"title":"Facile Doping of 2,2,2-Trifluoroethanol to Single-Walled Carbon Nanotubes Electrodes for Durable Perovskite Solar Cells","authors":"Naoki Ueoka, Achmad Syarif Hidayat, Hisayoshi Oshima, Yoshimasa Hijikata, Yutaka Matsuo","doi":"10.3390/photochem4030019","DOIUrl":"https://doi.org/10.3390/photochem4030019","url":null,"abstract":"Perovskite solar cells with an indium tin oxide (ITO)/SnO2/CH3NH3PbI3/Spiro-OMeTAD/2,2,2-trifluoroethanol (TFE) doped single-walled carbon nanotube (SWCNT) structure were developed by dropping TFE onto SWCNTs, which replaced the metal back electrode, and a conversion efficiency of 14.1% was achieved. Traditionally, acidic doping of the back electrode, SWCNT, has been challenging due to the potential damage it may cause to the perovskite layer. However, TFE has facilitated easy doping of SWCNT as the back electrode. The sheet resistance of the SWCNTs decreased and their ionization potential shifted to deeper levels, resulting in improved hole transport properties with a lower barrier to carrier transport. Furthermore, the Seebeck coefficient (S) increased from 34.5 μV/K to 73.1 μV/K when TFE was dropped instead of EtOH, indicating an enhancement in the behavior of p-type charge carriers. It was observed that hydrophilic substances adhered less to the SWCNT surface, and the formation of PbI2 was suppressed. These effects resulted in higher conversion efficiency and improved solar cell performance. Furthermore, the decrease in conversion efficiency after 260 days was suppressed, showing improved durability. The study suggests that combining SWCNTs and TFEs improves solar cell performance and stability.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141649715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Review of Visible Light Responsive Photocatalysts for Arsenic Remediation in Water 可见光响应型光催化剂在水砷修复中的应用综述

Photochem Pub Date : 2024-04-17 DOI: 10.3390/photochem4020012

I. Natali Sora, Francesca Fontana, R. Pelosato, B. Bertolotti

引用次数: 0

Excited-State Dynamics of Carbazole and tert-Butyl-Carbazole in Thin Films 薄膜中咔唑和叔丁基咔唑的激发态动力学

Photochem Pub Date : 2024-04-09 DOI: 10.3390/photochem4020011

Konstantin Moritz Knötig, Domenic Gust, K. Oum, T. Lenzer

{"title":"Excited-State Dynamics of Carbazole and tert-Butyl-Carbazole in Thin Films","authors":"Konstantin Moritz Knötig, Domenic Gust, K. Oum, T. Lenzer","doi":"10.3390/photochem4020011","DOIUrl":"https://doi.org/10.3390/photochem4020011","url":null,"abstract":"Thin films of carbazole (Cz) derivatives are frequently used in organic electronics, such as organic light-emitting diodes (OLEDs). Because of the proximity of the Cz units, the excited-state relaxation in such films is complicated, as intermolecular pathways, such as singlet–singlet annihilation (SSA), kinetically compete with the emission. Here, we provide an investigation of two benchmark systems employing neat carbazole and 3,6-di-tert-butylcarbazole (t-Bu-Cz) films and also their thin film blends with poly(methyl methacrylate) (PMMA). These are investigated by a combination of atomic force microscopy (AFM), femtosecond and nanosecond transient absorption spectroscopy (fs-TA and ns-TA) and time-resolved fluorescence. Excitonic J-aggregate-type features are observed in the steady-state absorption and emission spectra of the neat films. The S1 state shows a broad excited-state absorption (ESA) spanning the entire UV–Vis–NIR range. At high S1 exciton number densities of about 4 × 1018 cm−3, bimolecular diffusive S1–S1 annihilation is found to be the dominant SSA process in the neat films with a rate constant in the range of 1–2 × 10−8 cm3 s−1. SSA produces highly vibrationally excited molecules in the electronic ground state (S0*), which cool down slowly by heat transfer to the quartz substrate. The results provide relevant photophysical insight for a better microscopic understanding of carbazole relaxation in thin-film environments.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140722913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Charge-Selective Photocatalytic Degradation of Organic Dyes Driven by Naturally Occurring Halloysite Nanotubes 天然存在的霍洛石纳米管驱动的电荷选择性有机染料光催化降解

Photochem Pub Date : 2024-03-28 DOI: 10.3390/photochem4020009

Ashim Pramanik, M. M. Calvino, L. Sciortino, P. Pasbakhsh, G. Cavallaro, G. Lazzara, Fabrizio Messina, A. Sciortino

{"title":"Charge-Selective Photocatalytic Degradation of Organic Dyes Driven by Naturally Occurring Halloysite Nanotubes","authors":"Ashim Pramanik, M. M. Calvino, L. Sciortino, P. Pasbakhsh, G. Cavallaro, G. Lazzara, Fabrizio Messina, A. Sciortino","doi":"10.3390/photochem4020009","DOIUrl":"https://doi.org/10.3390/photochem4020009","url":null,"abstract":"This study explores the use of Halloysite NanoTubes (HNTs) as photocatalysts capable of decomposing organic dyes under exposure to visible or ultraviolet light. Through a systematic series of photocatalytic experiments, we unveil that the photodegradation of Rhodamine B, used as a model cationic dye, is significantly accelerated in the presence of HNTs. We observe that the extent of RhB photocatalytic degradation in 100 min in the presence of the HNTs is ~four times higher compared to that of bare RhB. Moreover, under optimized conditions, the as-extracted photodegradation rate of RhB (~0.0022 min−1) is comparable to that of the previously reported work on the photodegradation of RhB in the presence of tubular nanostructures. A parallel effect is observed for anionic Coumarin photodegradation, albeit less efficiently. Our analysis attributes this discrepancy to the distinct charge states of the two dyes, influencing their attachment sites on HNTs. Cationic Rhodamine B molecules preferentially attach to the outer surface of HNTs, while anionic Coumarin molecules tend to attach to the inner surface. By leveraging the unique properties of HNTs, a family of naturally occurring nanotube structures, this research offers valuable insights for optimizing photocatalytic systems in the pursuit of effective and eco-friendly solutions for environmental remediation.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140372061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Torsional Disorder in Tetraphenyl [3]-Cumulenes: Insight into Excited State Quenching 四苯基 [3]- 茂金属中的扭转紊乱：对激发态淬火的洞察

Photochem Pub Date : 2024-02-09 DOI: 10.3390/photochem4010008

David C. Bain, Julia Chang, Yihuan Lai, Thomas Khazanov, Phillip J. Milner, A. Musser

引用次数: 0

Torsional Disorder in Tetraphenyl [3]-Cumulenes: Insight into Excited State Quenching 四苯基 [3]- 茂金属中的扭转紊乱：对激发态淬火的洞察

Photochem Pub Date : 2024-02-09 DOI: 10.3390/photochem4010008

David C. Bain, Julia Chang, Yihuan Lai, Thomas Khazanov, Phillip J. Milner, A. Musser

引用次数: 0

Evaluation of MAA Analogues as Potential Candidates to Increase Photostability in Sunscreen Formulations 将 MAA 类似物作为提高防晒配方光稳定性的潜在候选物质进行评估

Photochem Pub Date : 2024-02-06 DOI: 10.3390/photochem4010007

Jacobo Soilán, Leonardo López-Cóndor, Beatriz Peñín, José Aguilera, M. V. de Gálvez, Diego Sampedro, R. Losantos

引用次数: 0

Evaluation of MAA Analogues as Potential Candidates to Increase Photostability in Sunscreen Formulations 将 MAA 类似物作为提高防晒配方光稳定性的潜在候选物质进行评估

Photochem Pub Date : 2024-02-06 DOI: 10.3390/photochem4010007

Jacobo Soilán, Leonardo López-Cóndor, Beatriz Peñín, José Aguilera, M. V. de Gálvez, Diego Sampedro, R. Losantos

引用次数: 0

Physicochemical Properties of Tungsten Trioxide Photoanodes Fabricated by Wet Coating of Soluble, Particulate, and Mixed Precursors 通过湿法涂覆可溶性、颗粒状和混合前驱体制造的三氧化钨光阳极的物理化学特性

Photochem Pub Date : 2024-02-01 DOI: 10.3390/photochem4010006

Valli Kamala Laxmi Ramya Chittoory, Marketa Filipsika, Radim Bartoš, M. Králová, P. Dzik

{"title":"Physicochemical Properties of Tungsten Trioxide Photoanodes Fabricated by Wet Coating of Soluble, Particulate, and Mixed Precursors","authors":"Valli Kamala Laxmi Ramya Chittoory, Marketa Filipsika, Radim Bartoš, M. Králová, P. Dzik","doi":"10.3390/photochem4010006","DOIUrl":"https://doi.org/10.3390/photochem4010006","url":null,"abstract":"Advanced oxidation processes are emerging technologies for the decomposition of organic pollutants in various types of water by harnessing solar energy. The purpose of this study is to examine the physicochemical characteristics of tungsten(VI) oxide (WO3) photoanodes, with the aim of enhancing oxidation processes in the treatment of water. The fabrication of WO3 coatings on conductive fluorine-doped tin oxide (FTO) substrates was achieved through a wet coating process that utilized three different liquid formulations: a dispersion of finely milled WO3 particles, a fully soluble WO3 precursor (acetylated peroxo tungstic acid), and a combination of both (applying a brick-and-mortar strategy). Upon subjecting the WO3 coatings to firing at a temperature of 450 °C, it was observed that their properties exhibited marked variations. The fabricated photoanodes are examined using a range of analytical techniques, including profilometry, thermo-gravimetric analysis (TGA), X-ray diffraction (XRD), and voltammetry. The experimental data suggest that the layers generated through the combination of particulate ink and soluble precursor (referred to as the brick-and-mortar building approach) display advantageous physicochemical properties, rendering them suitable for use as photoanodes in photoelectrochemical cells.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139880993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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