http://localhost:8080/xmlui/handle/123456789/21 Sun, 26 Apr 2026 08:24:52 GMT 2026-04-26T08:24:52Z http://localhost:8080/xmlui/handle/123456789/3925 Title: Metal-Displacement-Derived Silver Nanoparticles for Visible-Light Catalysis and TENG-Enabled Circuit Integration Authors: Kandikonda, Rajani Kumar; Katru, Rajesh; Madathil, Navaneeth; Venkatesh, Nachimuthu; Nagapuri, Raju; Rajaboina, Rakesh Kumar; Divi, Haranath; Mallu, Chenna Reddy; Dhayalan, Manikandan; Murugadoss, Govindhasamy; Uday Kumar, Khanapuram Abstract: One of the main challenges in silver nanoparticle research is developing a quick, scalable, and environmentally friendly synthesis method that also produces stable particles suitable for various applications. To address this challenge, we propose an eco-friendly, simple and efficient approach using the metal-displacement process that enables room-temperature formation of uniformly dispersed and oxidation resistant Ag NPs (25-50 nm). In this method, magnesium (Mg) acts as a sacrificial reductant, while tartaric acid serves as both a reducing agent and a capping agent. This novel magnesium-tartrate dual agent enables quick nucleation growth at room temperature, avoiding harsh chemicals, and yields uniformly dispersed Ag NPs with strong oxidation resistance. The synthesised Ag NPs were characterised for structural, optical, and surface analyses, confirming the formation of pure metallic Ag0 NPs with high stability due to tartarate chelation. These Ag NPs exhibited excellent photocatalytic activity, degrading 91.6% of Acid Yellow and 89.4% of Rose Bengal within 180 minutes under visible light, following first-order kinetics. Furthermore, the Ag NPs were formulated into a conductive ink capable of producing low-resistance printed tracks. The output of a triboelectric nanogenerator (TENG) was directly delivered to LEDs via these Ag-ink-printed pathways, enabling self-powered illumination of 240 LEDs. Overall, the present work provides a robust, scalable solution for multifunctional Ag NPs suitable for environmental remediation and next generation printed electronics. Description: NITW Thu, 01 Jan 2026 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3925 2026-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3924 Title: MXene-MolecularChromophoreTriboelectricSystemsforSelf PoweredNoble-GasDischarge Authors: Mudu, Suman; Chuncha, Vijaykumar; Navaneeth, M; Raju, Pembarthi; Devarayapalli, Kamakshaiah Charyulu; Chitta, Raghu; G, Manjula; Mishra, Palash; Lee, Dae Sung; Khanapuram, Uday Kumar; Rajaboin, Rakesh Kumar Abstract: Identifying triboelectricmaterial pairs capable of deliveringhighperformanceremainsakeychallengeforadvancing triboelectricnanogenerator(TENG)technologies.Toaddress the challenge, we have investigated a triboelectric pair comprising tribo-negative PDMS/MXene(Ti3C2Tx) with a potent tribo positive material, triphenylamine−phenyl−benzothiazole (TPA Ph-BTZ). In this work, the triboelectric propertiesof TPA-Ph BTZwerefirstsystematicallydeterminedbypairingitwithaseries of standard frictionalmaterials, confirming thatTPA-Ph-BTZ is tribo-positive. Building onour findings, we engineeredPDMS/ MXenecompositefilmswithvaryingMXeneloadingsandcoupled themwithTPA-Ph-BTZtoexplore synergistic charge-generation mechanisms. Comprehensivemeasurements, including electrical output, surface potential, dielectric constant, andwettability, revealedthatMXenereinforcement significantlyenhances thecharge-storageabilityandeffectivecontactbehaviorofPDMS.The TPA-Ph-BTZ-PDMS/MXene(2wt%)TENGdeliveredthehighestelectricaloutputof∼290V,∼100μA,andapowerdensityof 2.77W/m2.Thedevicealsoshowedstableoperationover10,000test cycles, confirming itsmechanical robustness. Further, an optimizedTENGwasusedinpoweringaseries-connected240LEDs.Beyondenergyharvesting, thehigh-voltageoutputof the TPA-Ph-BTZ−PDMS/MXeneTENGis furtherdemonstratedforself-poweredactivationofdischargetubes forneon,establishing anapplicationpathway for triboelectric-drivendischarge electronics. This study establishesTPA-Ph-BTZ−MXene/PDMSas a highlyefficient triboelectricpairing,offeringadesignpathwayformolecular-material-basedTENGs. Description: NITW Thu, 01 Jan 2026 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3924 2026-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3923 Title: Upcycling Expired Silicone Sealants into High-Performance Triboelectric Nanogenerators for Sustainable Energy Harvesting and Smart Infrastructure Safety Systems Authors: Kaki, Anusha; Velpula, Mahesh; Madathil, Navaneeth; Uday Kumar, Khanapuram; Kisannagar, Ravinder Reddy; Jung, Inhwa; Rajaboina, Rakesh Kumar Abstract: The present study addresses the industrial waste management of nonbiodegradable expired/waste silicone sealants (SS) through triboelectric nanogenerator technology (TENG). It explores the upcycling of waste SS as a frictional layer in a TENG to harness mechanical energy for sustainable applications. Among all the fabricated TENG devices, the SS-fluorinated ethylene propylene (FEP) frictional pair generated a maximum Voc of 320V and Isc of 145μA, with an instantaneous power density of 5.7W/m2. The device demonstrated excellent stability over 4000 cycles, allowing reliable operation in powering 240 light emitting diodes (LEDs), four LED lamps, and portable electronic devices such as calculators and digital watches through a charged capacitor. Finally, the SS-FEP TENG was utilized in a rail switch sensor system to monitor switch movements and provide real-time track status for enhanced rail safety. Description: NITW Thu, 01 Jan 2026 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3923 2026-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3922 Title: Transition metal chalcogenides as emerging triboelectric materials for high-performance energy harvesting devices Authors: M, Gopinath; Katru, Rajesh; Madathil, Navaneeth; Raju, Pembarthi; Uday Kumar, Khanapuram; Kisannagar, Ravinder Reddy; Jung, Inhwa; Rajaboina, Rakesh Kumar Abstract: The search for efficient, stable, and positive triboelectric materials is urgently needed to advance triboelectric nanogenerator (TENG) technology. Addressing this gap not only enhances device performance but also supports broader sustainability objectives, aligning with SDG-driven efforts toward clean energy, innovation, and responsible material use. While progress has been made with many negative triboelectric materials, the development of their positive counterparts remains limited. Therefore, bridging this gap is essential for achieving higher efficiency TENGs. In the present work, we propose transition metal chalcogenides (TMCs), specifically vanadium tetrasulfide (VS4), as a new tribopositive material for the first time. The positive triboelectric nature of VS4 is experimentally verified with simple electrostatic interaction tests, surface potential values and TENG-based tests. The VS4-based TENG achieves an open-circuit voltage of ∼1.52 kV, a short-circuit current of ∼180 mA, a transferred charge of ∼200 nC, and a power density of 14.45 W m−2 under biomechanical hand-tapping force. The obtained performance is the highest among the sulphur-TMC-based TENGs reported to date. This high performance TENG device was capable of powering a series-connected array of 720 light-emitting diodes (LEDs) and 6 LED bulbs. The present findings establish VS4 as a new positive material for the development of triboelectric energy harvesting and self-powered systems. Description: NITW Thu, 01 Jan 2026 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3922 2026-01-01T00:00:00Z