Journal of Materials Chemistry C最新文献

{"title":"A polymer rigidity probe based on ultralong organic room temperature phosphorescence of a new skeleton benzo[4,5]imidazo[1,2-a]pyridine","authors":"Jiaxin Ma, Jingjuan Bai, Lin Han, Xingda Zhang, Yiran Liu, Lijuan Bu, Zewei Li, Mingxing Chen, Zhimin Ma, Zhiyong Ma","doi":"10.1039/d4tc02846e","DOIUrl":"https://doi.org/10.1039/d4tc02846e","url":null,"abstract":"Herein, we report a new organic phosphorescence backbone, benzo[4,5]imidazo[1,2-<em>a</em>]pyridine (BNPy). BNPy-1 and BNPy-2 are obtained by introducing a benzene ring to each end of BNPy. BNPy itself shows no ultralong organic room temperature phosphorescence (UORTP) activity. Interestingly, for both BNPy-1 and BNPy-2, having one more benzene ring activates their UORTP properties notably. Firstly, photophysical properties of the three molecules were studied in solution and in pure powder state. At 77 K, BNPy-1 and BNPy-2 both demonstrated intense intrinsic phosphorescence with &gt;460 ms and &gt;670 ms ultralong lifetimes in solution, while BNPy showed weak intrinsic phosphorescence with &lt;65 ms lifetimes, suggesting that having one more benzene ring has a significant impact on ultralong phosphorescence. Pure powders of BNPy-1 and BNPy-2 displayed red-shifted ultralong phosphorescence at 77 K, assigned to aggregate phosphorescence. Secondly, all three molecules were doped into a PMMA film and PVA film separately and the phosphorescence behavior of the doped polymer films was investigated. BNPy exhibited no phosphorescence in both films at room temperature; BNPy-1 and BNPy-2 showed intense yellow and green phosphorescence, respectively. TD-DFT calculations and SOC values showed that the BNPy skeleton possesses a high ISC efficiency but having one more benzene ring has not significantly enhanced the ISC efficiency. It is proposed that having one more benzene ring greatly reduces the non-irradiative rate <em>via</em> enlarging the size of BNPy-1 and BNPy-2. However, only the intrinsic phosphorescence of BNPy-1 can be activated by the powder matrix DMAP, indicating that charge transfer and charge recombination occur efficiently between BNPy-1 and DMAP. More interestingly, copolymerization of methyl acrylate (MA) and acrylic acid (AA) with BNPy-1/BNPy-2 enabled ultralong room temperature phosphorescence with a duration time of over 10 s. The phosphorescence intensity and lifetime greatly depended on the matrix rigidity of the AA/MA copolymers, which was determined by the weight ratio of AA. In particular, for BNPy-1, the changing trend of the phosphorescence lifetime with the AA ratio correlated well with the changing trend of the matrix <em>T</em><small>_g</small>, which visually reflected the matrix rigidity. Thus, BNPy-1 can be used as an efficient polymer rigidity (or <em>T</em><small>_g</small>) probe. It is noteworthy that BNPy-1 is a pure organic phosphorescence molecule, devoid of a naphthalene structure. We believe that this study will provide deep insight into the structure–performance relationship of organic phosphorescence systems.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Van der Waals integration of phase-pure 2D perovskite sheets and GaAs nanowires for self-driven photodetector†","authors":"Zhi-Hong Zhang, Xiao-Bing Hou, Shang-Heng Li, Zhi-Peng Wei, Jin-Chao Wei, Peng Li and Shuang-Peng Wang","doi":"10.1039/D4TC02994A","DOIUrl":"10.1039/D4TC02994A","url":null,"abstract":"<p >Semiconductor heterostructures hold significant importance for exploring novel functional optoelectronic devices, but the chemical instability and soft lattice framework of perovskites significantly hinder the efficient heterogeneous integration with other perovskite or semiconductor materials. Herein, based on the large-area phase-pure 2D perovskite sheets, a BA<small>₂</small>MA<small>₂</small>Pb<small>₃</small>I<small>₁₀</small>/GaAs van der Waals (vdW) heterostructure has been successfully constructed. The favorable vdW contacts allow the device to be cut-off at forward bias with a remarkably low dark current of 1.94 pA. This endows the heterostructure device with excellent detection performance, achieving a linear dynamic range of 80.9 dB and a detectivity of 6.17 × 10<small>¹⁰</small> Jones. Additionally, the interfacial potential of the heterostructure enables the device to operate in a self-driven manner across broad spectral ranges from ultraviolet to near-infrared. Our study demonstrates efficient vdW integration based on perovskite and provides a new foundation for constructing perovskite vdW heterostructures.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/tc/d4tc02994a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Voltage controlled polarity switching of photoresponse in graphene oxide-based memristor","authors":"Soma Saha, Anindya Datta, Tapanendu Kundu","doi":"10.1039/d4tc02812k","DOIUrl":"https://doi.org/10.1039/d4tc02812k","url":null,"abstract":"The electrical and optoelectrical characteristics of graphene oxide thin film have been studied to establish its potential for various device applications. Symmetric nonlinear hysteresis in a current–voltage space, a typical memristor characteristic, has been observed using a planar metal/insulator/metal configuration. The obtained current–voltage behavior of the device has been visualized based on the voltage-dependent contributions from various charge carriers in the presence of different trap sites in the fabricated thin film. The uniqueness of this device's characteristics is to show a bias voltage-dependent polarity switching of photoresponse under illumination, and this photoswitching occurs through a switching voltage point (∼2 V). The time dynamics of this photocurrent reveal that under a low bias voltage (&lt;2 V), the device shows capacitive memristor characteristics. The exponentially growing photocurrent is additive in nature, and the device shows the photoresponse having a time constant of ∼2 s at +1 V. As bias voltage increases (&gt;2 V), another current appears opposite to the normal photocurrent that depends on the bias voltage and intensity of illumination. A detailed analysis of the time dynamics of photoresponse reveals that the time constant of this current changes from ∼9 s (+2 V) to ∼5 s (+4 V). The observed photoswitching is due to different time constants of these counter-interacting currents, resulting in polarity switching. Here, we attempt to shed light on the fundamental mechanisms that connect the nonlinear, nonzero crossing hysteresis observed in the electrical characteristics with its voltage-dependent photoswitching that can be judicially exploited for conceptualizing graphene oxide-based photonic devices.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"D-(+)-Glucose triggered selective hydrometallogelation in a C3-symmetric gelator","authors":"Moupia Mukherjee, Yeeshu Kumar, Abul Kalam, Mrigendra Dubey","doi":"10.1039/d4tc00655k","DOIUrl":"https://doi.org/10.1039/d4tc00655k","url":null,"abstract":"A chiral and conductive hydrometallogel was synthesized using dynamic boronic acid-<em>cis</em> diol chemistry. A novel tris-boronic acid-functionalized <em>C</em><small>₃</small>-symmetric gelator (<strong>MB</strong>) was obtained from a trimesic acid derivative, which upon deprotonation (MOH, M = Li, Na, K, and Cs), followed by addition of <small>D</small>-(+)-glucose, triggered hydrometallogel formation. Gel formation was highly selective to <small>D</small>-(+)-glucose among all the screened sugars. To the best of our knowledge, <small>D</small>-(+)-glucose-triggered hydrometallogel formation using a <em>C</em><small>₃</small>-symmetric tris-boronic acid-derived gelator has not been reported. <small>D</small>-(+)-Glucose-triggered gelation was comprehensively investigated using FTIR spectroscopy, UV-vis spectroscopy, circular dichroism, FESEM, <small>¹</small>H NMR spectroscopy, ESI-mass spectrometry, rheology and electrochemical impedance spectroscopy techniques. A reasonably high yield stress (6000 Pa) value was achieved for 5 wt% gel, supporting the observation of the interesting mechanical properties and robust nature of gels. Moreover, impedance spectroscopic study revealed an appreciable conductance value of 2.67 × 10<small>⁻²</small> S cm<small>⁻¹</small>, which could be further improved to 8.90 × 10<small>⁻²</small> S cm<small>⁻¹</small> by adding excess LiOH into the gel matrix without compromising its metallogel structural integrity.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temperature dependence of charge transport in molecular ensemble junctions","authors":"Ryan P. Sullivan, John T. Morningstar, Manikanta Makala, Mark E. Welker, Oana D. Jurchescu","doi":"10.1039/d4tc01807a","DOIUrl":"https://doi.org/10.1039/d4tc01807a","url":null,"abstract":"Understanding charge transport across molecule–electrode interfaces is essential for advancing organic electronic devices, yet its underlying mechanisms remain incompletely understood. Here, we investigate the temperature dependence of conductivity in molecular junctions under various biasing regimes. By examining devices with both low and high current rectification, we identify the conditions leading to temperature-activated transport and the less common phenomenon where conductance decreases with increasing temperature. The current increase with temperature is consistent with previous findings in similar systems and is attributed to thermally assisted tunneling and incoherent tunneling processes. Notably, the discovery of the regime with a negative temperature coefficient for conductance provides the first experimental validation of theoretical frameworks that unify Landauer formalism with Marcus theory, which we attribute to entropic effects influencing the molecular conformation. These measurements have also captured the emergence of new electronic states arising from the co-assembly of molecules containing electron donor and acceptor moieties. Our results decipher key aspects related to charge transport in molecular junctions and leveraging these insights holds significant promise for accelerating the development of more complex devices that exploit electrode–molecule interfaces for tunable functionality.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction: Laser assisted photocatalytic reduction of metal ions by graphene oxide","authors":"Sherif Moussa, Garrett Atkinson, M. SamyEl-Shall, Ahmed Shehata, Khaled M. AbouZeid and Mona B. Mohamed","doi":"10.1039/D4TC90142H","DOIUrl":"https://doi.org/10.1039/D4TC90142H","url":null,"abstract":"<p >Correction for ‘Laser assisted photocatalytic reduction of metal ions by graphene oxide’ by Sherif Moussa <em>et al.</em>, <em>J. Mater. Chem.</em>, 2011, <strong>21</strong>, 9608–9619, https://doi.org/10.1039/C1JM11228G.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/tc/d4tc90142h?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142174054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tunability of topological edge states in germanene at room temperature","authors":"Dennis J. Klaassen, Ilias Boutis, Carolien Castenmiller, Pantelis Bampoulis","doi":"10.1039/d4tc02367f","DOIUrl":"https://doi.org/10.1039/d4tc02367f","url":null,"abstract":"Germanene is a two-dimensional topological insulator with a large topological band gap. For its use in low-energy electronics, such as topological field effect transistors and interconnects, it is essential that its topological edge states remain intact at room temperature. In this study, we examine these properties in germanene using scanning tunneling microscopy and spectroscopy at 300 K and compare the results with data obtained at 77 K. Our findings show that the edge states persist at room temperature, although thermal effects cause smearing of the bulk band gap. Additionally, we demonstrate that, even at room temperature, applying an external perpendicular electric field switches the topological states of germanene off. These findings indicate that germanene's topological properties can be maintained and controlled at room temperature, making it a promising material for low-energy electronic applications.","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":7.393,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Promoting solution-processed CdTe nanocrystal solar cells via rationally controlled copper doping†","authors":"Qichuan Huang, Songwei Liu, Chenbo Min, Zheng Zhou, Donghuan Qin, Dan Wang, Wei Xu and Lintao Hou","doi":"10.1039/D4TC02669A","DOIUrl":"https://doi.org/10.1039/D4TC02669A","url":null,"abstract":"<p >The back contact of p-type semiconductors and metal electrodes have always been a difficulty in fabricating photovoltaics with high performance. The incompatibility of high HOMO with a metal work function may lead to Schottky contact at a back semiconductor–metal interface and lead to device inversion. Thus, the performance of the photovoltaic is restricted, especially for solution-processed CdTe NC solar cells. In our research, we proposed using Cu salts as a Cu source to dope CdTe NCs and improve the back contact interface. Enhanced performance in solution-processed NC solar cells is achieved by introducing an engineered Cu salt layer (CuCl<small>₂</small> and CuBr<small>₂</small>). Exceptional performance is attained with the optimized CdTe NC doped with CuCl<small>₂</small>, exhibiting a high short-circuit current of 20.20 mA cm<small>⁻²</small>, an open-circuit voltage of 0.58 V, and a fill factor of 53.74%, resulting in a power conversion efficiency of 6.3%. These results represent a significant improvement over the control group. Through detailed first principles studies and experimental verification, we demonstrate that the copper halide-doped CdTe NC thin film is promising to promote the carrier concentration of the CdTe NC and suppress carrier recombination by improving band alignment at the back contact interface.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142246647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent advances in elemental doping and simulation techniques: improving structural, photophysical and electronic properties of titanium dioxide","authors":"Yash Taneja, Dheeraj Dube and Ranbir Singh","doi":"10.1039/D4TC02031F","DOIUrl":"https://doi.org/10.1039/D4TC02031F","url":null,"abstract":"<p >Titanium dioxide (TiO<small>₂</small>) has emerged as a vital component in a wide range of photocatalytic and optoelectronic applications. In recent years, considerable attention has been directed towards elemental doping to achieve exceptional physical properties such as high absorption coefficient, tuneable band gap, high electron mobility, adaptability to varying temperatures, and robust stability. Despite these merits, doping in TiO<small>₂</small> presents significant challenges due to uncontrolled synthesis, ultraviolet instability, high trap density, chemical reactivity, and non-uniform thin film deposition. This review article aims to comprehensively assess the current theoretical and experimental state of doped TiO<small>₂</small> thin film synthesis, properties, and applications. Moreover, computational analysis using various software and strategies was investigated to assess performance while addressing encountered challenges during elemental doping. A comparative analysis is presented on the use of <em>ab initio</em> and molecular dynamics (MD) simulations, with a primary focus on TiO<small>₂</small> doping with elements such as iron (Fe), nitrogen (N), cobalt (Co), yttrium (Y), magnesium (Mg), tin (Sn), and others. Overall, this review offers a comprehensive understanding of the elemental doping in TiO<small>₂</small>, demonstrating exceptional outcomes, and explores potential prospects, shedding light on elements that exhibit promise but necessitate further in-depth investigation.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142320564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chiral cadmium–amine complexes for stimulating non-linear optical activity and photoluminescence in solids based on aurophilic stacks†","authors":"Kseniia Boidachenko, Michal Liberka, Junhao Wang, Hiroko Tokoro, Shin-ichi Ohkoshi and Szymon Chorazy","doi":"10.1039/D4TC01042F","DOIUrl":"10.1039/D4TC01042F","url":null,"abstract":"<p >The design of high-performance optical materials can be realized using coordination polymers (CPs) often supported by non-covalent interactions, such as metallophilicity. The challenge is to control two or more optical effects, <em>e.g.</em>, non-linear optics (NLO) and photoluminescence (PL). We present a new strategy for the combination of the NLO effect of second-harmonic generation (SHG) and the visible PL achieved by linking dicyanidoaurate(<small>I</small>) ions, which form luminescent metallophilic stacks, with cadmium(<small>II</small>) complexes bearing chiral amine ligands, used to break the crystal's symmetry. We report a family of NLO- and PL-active materials based on heterometallic Cd(<small>II</small>)–Au(<small>I</small>) coordination systems incorporating enantiopure propane-1,2-diamine (pda) ligands (<strong>1</strong>-<em>S</em>, <strong>1</strong>-<em>R</em>), their racemate (<strong>2</strong>), and enantiopure <em>trans</em>-cyclopentane-1,2-diamine (cpda) ligands (<strong>3</strong>-<em>S</em>, <strong>3</strong>-<em>R</em>). Due to acentric space groups, they exhibit the SHG signal, tunable within the range of 11–24% of the KDP reference, which was correlated with the dipole moments of Cd(<small>II</small>) units. They show efficient blue PL whose energy and quantum yield, the latter ranging from 0.40 to 0.83, are controlled by Cd(<small>II</small>) complexes affecting the Au–Au distances and vibrational modes. We prove that chiral Cd(<small>II</small>)–amine complexes play the role of molecular agents for the stimulation of both the NLO and PL of the materials based on aurophilic stacks.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11343038/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142054294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}