Review
Chemistry, Multidisciplinary
Arun V. Baskar, Mercy R. Benzigar, Siddulu Naidu Talapaneni, Gurwinder Singh, Ajay S. Karakoti, Jiabao Yi, Ala'a H. Al-Muhtaseb, Katsuhiko Ariga, Pulickel M. Ajayan, Ajayan Vinu
Summary: Functionalized fullerene nanostructures with excellent optoelectronic properties and fast charge transfer capabilities are suitable for various applications such as polymer solar cells and drug delivery. Fine control over their surface and bulk properties can be achieved through different synthesis methods and chemical modifications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Review
Pharmacology & Pharmacy
Pamela M. Lundin, Briana L. Fiser, Meghan S. Blackledge, Hannah L. Pickett, Abigail L. Copeland
Summary: Bacterial infections caused by biofilms are responsible for 80% of bacterial infections in humans. The use of self-assembled monolayers (SAMs) as a chemical strategy to combat biofilm formation shows promise due to their strong covalent bonds and versatile synthesis. This review focuses on the use of SAMs to inhibit biofilm formation and graft biocidal agents, with potential applications in indwelling medical devices. The challenges and future directions for this field are also discussed.
Article
Chemistry, Analytical
Giulia Moro, Cedrix J. Dongmo Foumthuim, Marco Spinaci, Ettore Martini, Dafne Cimino, Eleonora Balliana, Peter Lieberzeit, Flavio Romano, Achille Giacometti, Rui Campos, Karolien De Wael, Ligia Maria Moretto
Summary: There is an urgent need for sensing strategies to screen perfluoroalkyl substances (PFAS) in aqueous matrices. Changes in fluorinated self-assembled monolayers (SAM) with different architectures were studied upon exposure to both long and short-chain PFAS. The applicability of fluorinated SAM in PFAS sensing was evaluated using electrochemical impedance spectroscopy and voltam-metric techniques, supported by molecular dynamics simulations. Pinhole/defect-free fluorinated SAM were found to be applicable to long-chain PFAS screening using a switch-on sensing strategy, while a switch-off sensing strategy was reported for screening of both short/long-chain PFAS.
ANALYTICA CHIMICA ACTA
(2022)
Review
Chemistry, Multidisciplinary
Limin Wang, Ulrich S. Schubert, Stephanie Hoeppener
Summary: Surface modification using self-assembled monolayers has seen significant advancement in the past decade, with the introduction of new chemical reactions such as nucleophilic substitution, click chemistry, supramolecular modification, photochemical reaction, and others, enhancing the properties of solid substrates like silicon and glass.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Christopher A. Petroff, Giuseppe Cassone, Jiri Sponer, Geoffrey R. Hutchison
Summary: This study presents novel piezoelectric force and touch sensors based on self-assembled monolayers of oligopeptides, which show large piezoelectric voltage response and are easily manufactured. Despite modest piezoelectric charge constants, the devices exhibit immense piezoelectric voltage constants. Additionally, a flexible device prototype with high open-circuit voltages is demonstrated, with potential for further improvements in voltage response through peptide selection and device construction.
ADVANCED MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Julien Gay, Agata Lachowicz, Nicolas Blondiaux, Gaelle A. L. Andreatta
Summary: This study presents a method for nickel and copper electroplating on solar cells using phosphonic acid self-assembled monolayers as masks. The chemical functionalization and deposition method of phosphonic acid were found to strongly influence the masking properties, and the binding modes of phosphonic acid were investigated using attenuated total reflectance Fourier transform infrared spectroscopy.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Thomas P. Gray, Jun Nishida, Samuel C. Johnson, Markus B. Raschke
Summary: This study demonstrates vibrational excitons as a molecular ruler for measuring the delocalization of intermolecular wave functions and nano-domain size in SAMs. By combining experimental measurements and modeling, the domain sizes and distribution of 4-NTP SAM on gold surface were revealed.
Article
Chemistry, Multidisciplinary
Yue Jiang, Haiyang Wang, Jihyun Baek, Dongwon Ka, Andy Huu Huynh, Yujie Wang, Michael R. Zachariah, Xiaolin Zheng
Summary: This study reports a novel multifunctional graphene-based additive, CFGO, which integrates the advantages of GO and GF, to significantly enhance the ignition and combustion performance of aluminum particles.
Article
Chemistry, Analytical
Cheryl Suwen Law, Juan Wang, Satyathiran Gunenthiran, Siew Yee Lim, Andrew D. Abell, Lutz Ahrens, Tushar Kumeria, Abel Santos, Nicolas H. Voelcker
Summary: This study presents an optical system for real-time, label-free detection of per- and polyfluoroalkyl substances (PFASs). By analyzing key sensing parameters, the researchers determined the optimal molecular length for maximizing sensitivity and selectivity to PFAS. The study also provides insights into the formation mechanism of PFAS self-assembled monolayers, and demonstrates the potential real-life applicability of the system.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Dennis Meier, Abhishek K. Adak, Peter Knecht, Joachim Reichert, Sourav Mondal, Nithin Suryadevara, Senthil Kumar Kuppusamy, Keitaro Eguchi, Matthias K. Muntwiler, Francesco Allegretti, Mario Ruben, Johannes V. Barth, Shobhana Narasimhan, Anthoula C. Papageorgiou
Summary: Tailored nano-spaces can control enantioselective adsorption and molecular motion through the spontaneous assembly of a dynamic system on Ag(111) using 2,6-bis(1H-pyrazol-1-yl)pyridine-4-carboxylic acid. The network cavity snugly hosts the chemically modified guest, bestows enantiomorphic adsorption, and allows selective rotational motions. Hydrogen bonding plays a crucial role in stabilizing the rotating guest and influencing the energy landscape formation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Youhai Liu, Nan Zhang, Dylan Tua, Yingkun Zhu, Jacob Rada, Wenhong Yang, Haomin Song, Alexis C. Thompson, R. Lorraine Collins, Qiaoqiang Gan
Summary: A superhydrophobic SERS chip combining 3D-assembled gold nanoparticles on nanoporous substrates is proposed for sensitive analyte enrichment. The chip demonstrates a sensitivity of 1 nm and a relative standard deviation of 2.2% for chip-to-chip reproducibility, showing potential for quantitative sensing of chemicals and drugs. It also enables trace analysis of fentanyl and fentanyl-heroin mixture in human saliva. This superhydrophobic chip paves the way for on-site and real-time drug sensing to tackle societal issues like drug abuse and the opioid crisis.
Article
Chemistry, Analytical
Zexuan Wei, Jingwen Song, Renzhi Ma, Katsuhiko Ariga, Lok Kumar Shrestha
Summary: This paper reports on the facile fabrication of novel corn-husk-shaped fullerene C-60 crystals and investigates their structure and properties. The CHFCs exhibit a mesoporous and hollow structure, and show excellent sensing performance towards acetic acid vapors.
Article
Chemistry, Multidisciplinary
Myung-Gyun Baek, Sang-Geon Park
Summary: By introducing self-assembled monolayers, the performance of OLED devices can be improved, and the wetting properties, surface roughness, and work function of the ITO surface can be controlled. SAM-modified devices demonstrate better performance, including higher current density, brightness, and lower turn-on voltage.
Article
Nanoscience & Nanotechnology
Sneha Sreekumar, Marzieh Heidari, Zhongkai Cheng, Hemanth Maddali, Krystal House, Heinz Frei, Elena Galoppini, Deirdre M. O'Carroll
Summary: In this study, the use of SAMs formed from disulfide lipoic acid-based compounds significantly improved charge injection in organic semiconductor devices by altering the interaction between the polymer and the metal surface. This research sheds light on how the nature of functional groups in SAMs and the number of bonds formed with the metal electrode influence the performance of organic semiconductor devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Deb Kumar Bhowmick, Adrian Joe Urban, Manfred Bartsch, Bjoern Braunschweig, Helmut Zacharias
Summary: Efficient control of interface chemistry enables better tunability of electronic properties, and a novel near-UV-initiated direct modification method has been demonstrated to form stable organic monolayers on silicon surfaces with high hydrolytic stability.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Wiebke Alex, Patrick Lorenz, Christian Henkel, Timothy Clark, Andreas Hirsch, Dirk M. Guldi
Summary: This study provides a detailed understanding of the full reaction coordinate of NBDs to QCs and reveals that the photoreversibility of NBDs is influenced by the charge-transfer character.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Markus Freiberger, Martin B. Minameyer, Iris Solymosi, Stefan Fruehwald, Marcel Krug, Youzhi Xu, Andreas Hirsch, Timothy Clark, Dirk M. Guldi, Max von Delius, Konstantin Amsharov, Andreas Goerling, M. Eugenia Perez-Ojeda, Thomas Drewello
Summary: We studied the gas-phase chemistry of [10]cycloparaphenylene ([10]CPP) non-covalent complexes with C-60 and C-70 using atmospheric pressure photoionization and electrospray ionization mass spectrometry. The stability and charge distribution of these complexes were analyzed using energy-resolved collision-induced dissociation (ER-CID). It was found that complexes with a C-70 core exhibited greater stability, and the radical cations were more stable than the radical anions. [2:1] complexes of the ([10]CPP2 superset of C-60/70)(+center dot/-center dot) type were observed as isolated solitary gas-phase species for the first time. The stability of these complexes was reduced compared to the [1:1] complexes.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Organic
Johannes Muller, Janina Buck, Andreas Hirsch
Summary: This paper presents nine pi-expanded mono-substituted 5,8,11,14,17-pentakis-(tert-butyl)-hexa-peri-hexabenzocoronenes (HBC) and explores their synthesis method and the influence of substitution groups on their optoelectronic properties.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Laura von Lueders, Rita Tilmann, Kangho Lee, Cian Bartlam, Tanja Stimpel-Lindner, Tarja K. Nevanen, Kristiina Iljin, Kathrin C. Knirsch, Andreas Hirsch, Georg S. Duesberg
Summary: We present a controllable and specific functionalisation approach for graphene field-effect transistors (GFETs) in order to detect small physiologically active molecules. The key step involves the noncovalent functionalisation of graphene with perylene bisimide (PBI) molecules directly on the growth substrate. This method allows for the homogeneous self-assembly of PBI molecules on graphene, followed by the immobilization of antibodies. The functionalised GFET devices showed excellent performance in terms of atomic force microscopy, Raman spectroscopy, and electrical measurements compared to conventional functionalisation methods. Specific sensing of small molecules such as methamphetamine and cortisol was achieved by monitoring the electrical changes of the functionalised GFET devices. The sensors were able to detect methamphetamine down to a concentration of 300 ng ml(-1).
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Felix Hemauer, Valentin Schwaab, Eva Marie Freiberger, Natalie J. Waleska, Andreas Leng, Cornelius Weiss, Johann Steinhauer, Fabian Duell, Philipp Bachmann, Andreas Hirsch, Hans-Peter Steinrueck, Christian Papp
Summary: This study investigates the surface chemistry of a derivatized norbornadiene/quadricyclane molecule pair and explores their potential as energy storage solutions for renewable energy sources. It demonstrates the success of triggering the release of stored energy on Pt(111) and reveals the decomposition pathways of the two isomers on Ni(111).
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Jovana Jaksic, Iris Solymosi, Andreas Hirsch, M. Eugenia Perez-Ojeda, Aleksandra Mitrovic, Veselin Maslak
Summary: This study presents the synthesis and characterization of four dumbbell-shaped fullerene molecules connected by isosorbide and isomannide moieties. The electrochemical behavior of these molecules and their ability to form complexes with [10]cycloparaphenylene ([10]CPP) were investigated. The results showed a high electron affinity for the fullerene dumbbells, indicating a strong interaction with carbon nanorings.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Organic
Sven Moersel, Rene Kellner, Andreas Hirsch
Summary: The synthesis of novel fluorinated hexa-peri-hexabenzocoronenes (HBCs) and their thioether-substituted analogs was reported, with the reaction time significantly reduced by using microwave assistance. Increasing fluorination or thioether-substituents led to a decrease in the extinction coefficient of the HBCs. Addition of thioether-moieties caused a shift in absorption and emission bands, while the nature of the thioether did not affect the optoelectronic properties. Oxidation to sulfone and formation of sulfonium salts further modified the electronic environment of the HBC core, resulting in decreased extinction coefficients and broadening of absorption and emission bands.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Iris Solymosi, Christian Neiss, Harald Maid, Frank Hampel, Thomas Solymosi, Andreas Gorling, Andreas Hirsch, M. Eugenia Perez-Ojeda
Summary: Crystal packing and chromophore communication play vital roles in applications related to light-energy harvesting and conversion. Obtaining crystals with flexible and soluble structures is challenging. However, a crystal structure of a highly flexible perylene-3,4 : 9,10-tetracarboxylic acid bisimide (PBI) cyclophane has been successfully obtained and analyzed, revealing a unique one-dimensional pi-stacking supramolecular polymer-like structure. The findings highlight the importance of crystal packing control for specific applications based on multiexciton generation processes.
Article
Nanoscience & Nanotechnology
Maria Kolesnik-Gray, Laura Meingast, Martin Siebert, Tim Unbehaun, Tobias Huf, Guenter Ellrott, Gonzalo Abellan, Stefan Wild, Vicent Lloret, Udo Mundloch, Julian Schwarz, Michael Niebauer, Maximilian Szabo, Mathias Rommel, Andreas Hutzler, Frank Hauke, Andreas Hirsch, Vojislav Krstic
Summary: In this work, the DC electrical transport characteristics of high-quality black phosphorus (BP) field-effect devices with different thicknesses were studied at room temperature. The experimental data showed that the conductivity and hole density increase non-trivially with a reduced number of layers while maintaining constant field-effect mobility due to electron-phonon scattering. The observed phenomena were found to be a direct consequence of significant interlayer coupling, resulting in a local redistribution of free charge carriers towards the central layers. It was also discovered that a naturally protected 2D hole gas can be encapsulated in BP flakes as thick as 10 nm due to the electrostatic environment.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Juan S. S. Rocha-Ortiz, Jianchang C. Wu, Jonas Wenzel, Andreas J. J. Bornschlegl, Jose Dario Perea, Salvador Leon, Anastasia Barabash, Anna-Sophie Wollny, Dirk M. M. Guldi, Jiyun Zhang, Alberto Insuasty, Larry Lueer, Alejandro Ortiz, Andreas Hirsch, Christoph J. J. Brabec
Summary: Dumbbell-shaped systems based on PAHs-BODIPY-triarylamine hybrids TM-(01-04) are designed and employed as hole-transporting materials in planar inverted perovskite solar cells, exhibiting remarkable stability and high power conversion efficiency. The conjugated pi-system's covalent attachment and size are found to influence the energy transfer within the systems. Integrating these systems into the solar cells results in outstanding power conversion efficiency, with TM-02-based devices achieving a PCE of 20.26%. The long-term stability of these devices is also measured, with TM-04-based device showing the highest stability of 94%.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Applied
Juan S. Rocha-Ortiz, Joel Jose Montalvo-Acosta, Yakun He, Alberto Insuasty, Andreas Hirsch, Christoph J. Brabec, Alejandro Ortiz
Summary: Eight novel C60-BODIPY-Triarylamine electroactive triads were synthesized and characterized, and the effect of different linkers and functionalization on the electronic properties were studied. The compounds showed strong absorption of visible light and photo-induced electron transfer, confirmed by solvatochromic effects and redox potentials. The study also found that the pyrrolidine derivatives were more stable than isoxazoline analogs and alkoxy units improved thermal endurance.
Article
Chemistry, Physical
Thomas Schmaltz, Felix Hartmann, Tim Wicke, Lukas Weymann, Christoph Neef, Jurgen Janek
Summary: Solid-state batteries are a promising advancement for lithium-ion batteries, but there are still challenges in material selection, safety, and cost. Hybrid material and cell concepts may be key to successful commercialization.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Markus Freiberger, Iris Solymosi, Eva Marie Freiberger, Andreas Hirsch, M. Eugenia Perez-Ojeda, Thomas Drewello
Summary: In this study, the stability of [n]cycloparaphenylene (nCPP)-based host-guest complexes with Li+@C-60 and C-60 was compared for the first time in both gas and solution phases. Results showed a significant increase in stability for the complexes featuring [9-12]CPP with Li+@C-60, which was also observed in solution. The formation of [10]CPP superset of Li+@C-60 exhibited a two orders of magnitude larger association constant compared to the C-60 analog, along with an increased binding entropy. This research contributes to a better understanding of host-guest complexes between [n]CPPs and endohedral metallofullerenes at a molecular level.
Article
Chemistry, Multidisciplinary
Wiebke Zika, Andreas Hirsch, Rene Weiss, Simone Pinter, Christoph M. Schuesslbauer, Timothy Clark, Andreas Hirsch, Dirk M. Guldi
Summary: This study investigates the interconversion between QC and NBD and their application in energy storage through photo-assays. An oxidative electron transfer is observed during the QC-to-NBD isomerization using transient absorption spectroscopy. The complementary use of time-resolved and steady-state spectroscopies allows for a complete description of the photoisomerization reaction of NBDs.
Article
Materials Science, Multidisciplinary
Narine Moses Badlyan, Nina Pettinger, Niklas Enderlein, Roland Gillen, Xin Chen, Wanzheng Zhang, Kathrin C. Knirsch, Andreas Hirsch, Janina Maultzsch
Summary: This study presents a Raman investigation of MoS2 powders and MoS2 individual layers functionalized with organic molecules. It is found that the functionalized MoS2 powders are oxidized into MoO3 upon increasing temperature, while the mechanically exfoliated individual MoS2 layers do not undergo the same transformation. During the covalent functionalization, few-layer MoS2 undergoes a partial transition from the 2H to the 1T' crystallographic phase.
