02651nas a2200205 4500008004100000022001400041245011100055210006900166260000900235300001600244490000700260520190600267653001802173653003002191100002202221700002302243700001702266700003002283856013202313 2023 eng d a2050-752600aFunctionalized CNT-azobenzene-PVA-based self-healing aqueous gel as a conductive photo-responsive actuator0 aFunctionalized CNTazobenzenePVAbased selfhealing aqueous gel as  cDEC  a16571-165770 v113 a

Conductive gels have gained attention from researchers owing to potential applications in flexible displays, implantable medical devices, touch panels, wearable electronic skin, sensors, soft robotics, etc. Photo-responsive conductance switching gels can make their way into various applications, including contact-free remote-controlled manipulation of the materials, implantable synthetic organs, and optical switches. Herein, we report an aqueous gel with boronic acid containing azobenzene crosslinker as the light-responsive part that can undergo reversible cis-trans isomerization on irradiation with UV-vis light and catechol functionalized single-walled carbon nanotube as a conductive part producing a self-healing aqueous gel with PVA. The 3D crosslinked gel network formed through the formation of boronic ester and hydrogen bonding between hydroxyl and boronic acid groups was confirmed using scanning electron microscopy, X-ray microtomography, and rheological experiments. Rheology results show that gel is a viscoelastic material with immediate self-healing properties. The presence of functionalized SWCNT in the gel matrix enhances the stability and results in a conductivity of up to 3.5 S cm-1 with a loading of 5 wt%. The gel network exhibits a photoresponsive conductance switching from 10 to 60 mu A with UV and visible light irradiation, respectively. The molecular level motions during the isomerization of azobenzene lead to macroscopic dynamic changes that can find applications in soft actuators. The photoresponsive conductivity switching and dynamic movements of the films make the present material suitable for contact-free switching applications. Responsive conductive gels have gained attention owing to potential applications in flexible displays, implantable medical devices, touch panels, wearable electronic skin, sensors, soft robotics, and related areas.

10aCyclodextrins10aSupramolecular Hydrogels,1 aNarayanan, Aswini1 aBhagyasree, T., M.1 aTorris, Arun1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/functionalized-cnt-azobenzene-pva-based-self-healing-aqueous-gel-conductive-photo-responsive02177nas a2200253 4500008004100000022001400041245011800055210006900173260000800242490000700250520127800257653002001535653001901555653003301574653001401607653001601621100003301637700002901670700002601699700001801725700002201743700003001765856012801795 2023 eng d a1433-785100aPolymerizable solvent-free organic liquids: a new approach for large area flexible and foldable luminescent films0 aPolymerizable solventfree organic liquids a new approach for lar cAUG0 v623 a

The high demand for light-emitting and display devices made luminescent organic materials as attractive candidates. Solvent-free organic liquids are one of the promising emitters among them due to the salient features. However, the inherent limitations of forming sticky and noncurable surfaces must be addressed to become an alternate emitter for large-area device applications. Herein, we functionalized solvent-free organic liquids having monomeric emission in bulk with polymerizable groups to improve the processability. The polymerizable group on carbazole, naphthalene monoimide, and diketopyrrolopyrrole-based solvent-free liquid emitters enabled on-surface polymerization. These emitters alone and in combinations can be directly coated on a glass substrate without the help of solvents. Subsequent photo or thermal polymerization leads to stable, non-sticky, flexible, foldable, and free-standing large-area films with reasonably high quantum yield. Our demonstration of the tunable and white light-emitting films using polymerizable solvent-free liquids might be a potential candidate in flexible/foldable/stretchable electronics. The new concept of polymerizable liquid can be extended to other functional features suitable for futuristic applications.

10aEnergy Transfer10apolymerization10aSolvent-Free Organic Liquids10aThin-Film10aWhite Light1 aWakchaure, Vivek, Chandrakan1 aVeer, Sairam, Dnyaneshwa1 aNidhankar, Aakash, D.1 aKumar, Viksit1 aNarayanan, Aswini1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/polymerizable-solvent-free-organic-liquids-new-approach-large-area-flexible-and-foldable01511nas a2200193 4500008004100000022001400041245011000055210007000165260000900235300001600244490000700260520080300267100001801070700002401088700002201112700002201134700003001156856013101186 2024 eng d a1359-734500aTailoring helical ends of π-extended [6]heterohelicenes to control optical, and electrochemical features0 aTailoring helical ends of πextended 6heterohelicenes to control  cOCT  a11944-119470 v603 a

The inherent helical chirality and improved pi-stacking capabilities endow helicenes with fascinating photophysical characteristics when decorated with lateral pi-extensions. Here, we report the synthesis and physicochemical characterization of expanded hetero[6]helicenes fused with thiadiazole and selenadiazole rings at the helical ends. Comparing these heterohelicenes revealed the impact of the heteroatom-embedded aromatic rings on the excited state and redox features. A small structural variation of the terminal rings from thiadiazole to selenadiazole caused a striking change in the heterohelical nanographenes. The inherent helical chirality and improved pi-stacking capabilities endow helicenes with fascinating photophysical characteristics when decorated with heteroatoms.

1 aKumar, Viksit1 aDongre, Sangram, D.1 aVenugopal, Geethu1 aNarayanan, Aswini1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/tailoring-helical-ends-%CF%80-extended-6heterohelicenes-control-optical-and-electrochemical02212nas a2200277 4500008004100000022001400041245008600055210006900141260000800210300001200218490000700230520131600237653001601553653001401569653002201583653002101605653001101626100001801637700003401655700002001689700002201709700002601731700003001757700003001787856011701817 2025 eng d a1613-681000aDiamondoid all-carbon porous aromatic framework host for lithium-sulfur batteries0 aDiamondoid allcarbon porous aromatic framework host for lithiums cJUN a25003880 v213 a

Lithium-sulfur batteries (LSBs) hold incredible potential as next-generation energy storage systems. However, practical applications of LSBs are significantly hindered by several critical challenges. For the first time, scalable all-carbon porous 3D polymers (3DPs) that do not contain heteroatoms or functional groups and do not require post-functionalization are investigated as hosts in lithium-sulfur batteries, demonstrating enhanced cycling stability and overall battery performance. The pyrene-containing 3DP exhibits 75% capacity retention after 600 cycles at 1 C and 52% capacity retention after 1300 cycles at 0.2 C, better than phenyl comprising 3DP. Furthermore, even at higher sulfur loading (4.1 mg cm(-2)) with an electrolyte/sulfur ratio of 5 mu L mg(-1), pyrene 3DP displayed a high capacity of 600 mA h g(-1) and stable performance over 250 cycles with negligible capacity fade. The defined pore structure of 3DPs prevents the migration of polysulfides through physical confinement and the large pi -clouds of 3DPs interact with the negative charge-bearing polysulfides generated in charge-discharge cycles through anion-pi interaction. In this way, The design ensures that the host 3DPs interact with neutral sulfur and anionic polysulfides, resulting in an excellent performance.

10a3D polymers10aBatteries10aLi-Sulfur battery10aporous materials10apyrene1 aKumar, Viksit1 aJavaregowda, Bharathkumar, H.1 aDevasia, George1 aNarayanan, Aswini1 aKrishnamurty, Sailaja1 aKrishnamoorthy, Kothandam1 aBabu, Sukumaran, Santhosh uhttps://library.ncl.res.in/content/diamondoid-all-carbon-porous-aromatic-framework-host-lithium-sulfur-batteries01458nas a2200253 4500008004100000022001400041245013900055210006900194260000800263300001400271490000700285520055800292100002400850700002800874700001900902700002000921700002300941700002200964700002300986700003001009700002101039700001801060856012601078 2025 eng d a1359-734500aMultifunctional luminogens with synergy of aggregation-induced delayed fluorescence, two-photon absorption and photocurrent generation0 aMultifunctional luminogens with synergy of aggregationinduced de cJAN a1447-14500 v613 a

In this study, we investigated the aggregation-induced delayed fluorescence (AIDF) properties of three luminogens - TN, TA, and TP. Our comprehensive theoretical analysis reveals a significant reduction in the Delta EST in their aggregated or solid-state, activating TADF, on a similar to mu s time-scale. Additionally, these luminogens demonstrate two-photon excited anti-Stokes photoluminescence emission and improved photocurrent generation, attributed to their strong charge transfer characteristics and longer singlet exciton lifetimes.

1 aChatterjee, Abhijit1 aNarayanan, Sundaravalli1 aThorat, Sachin1 aMalik, Ajay, J.1 aAmbhore, Madan, D.1 aNarayanan, Aswini1 aSihag, Anil, Kumar1 aBabu, Sukumaran, Santhosh1 aLahiri, Mayurika1 aHazra, Partha uhttps://library.ncl.res.in/content/multifunctional-luminogens-synergy-aggregation-induced-delayed-fluorescence-two-photon