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40 results on '"Sajid, Memoon"'

15. Fabrication, Comparison, Optimization, and Applications of Conductive Graphene Patterns Induced via CO2and Diode Lasers

Author

Sajid, Memoon, Awan, Faisal Saeed, Javed, Mazhar, Khattak, Zarak Jamal, Hussain, Gohar, Shah, Syed Farhad, Rahman, Khalid, and Saleem, Mohsin

Abstract

Fabrication of conductive patterns for flexible and printed electronic devices is one of the most challenging steps in the whole process. Conductive patterns in electronic devices are used as electrodes, transducers, connecting links, and sometimes, also as the active sensing elements. Since the introduction of laser induced graphene (LIG), it has been explored to print electrodes and connecting patterns for various electronic devices and systems. This work focuses on an in-house developed laser printing system and the comparison of various electrical, chemical, and morphological properties of the resulting LIG patterns using CO2and diode lasers. The system parameters including the laser power, relative printing speed, and the printing resolution were explored and optimized to achieve conductive patterns with varying properties suitable for various targeted applications. The fabricated patterns were characterized for their sheet resistance, surface morphology, chemical properties, and physical size and resolution. Continuous conductive patterns with sheet resistance in range of 11.5 Ω/□ to 43 Ω/□ were achieved using CO2laser with a minimum achievable pattern width of ~ 180 μm while patterns with sheet resistance in range of 19 Ω/□ to 105 Ω/□ were achieved using diode laser with a minimum pattern width of ~ 190 μm. The chemical and morphological properties of CO2laser-based patterns indicate the formation of 2D graphite sheets with high porosity and low O2concentration while the diode laser-based patterns have a lower porosity and higher percentage of O2indicating burning and formation of oxides. Various applications of both types have also been discussed based on their respective properties.

Published
2023
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17. Fabrication of Temperature- and Humidity-Independent Silver Nanoparticle's Carbon Composite-Based Strain Sensor Through Additive Manufacturing Process

Author

Muhammad Shakeel, Amin Mohsin, Iqbal Nadeem, Ahmad Salman, Amin Qausaria Tahseen, Rahman Khalid, and Sajid Memoon

Subjects
Materials science, Fabrication, Manufacturing process, Materials Science (miscellaneous), Composite number, chemistry.chemical_element, Humidity, Strain sensor, Industrial and Manufacturing Engineering, Silver nanoparticle, Highly sensitive, chemistry, Composite material, Carbon
Abstract

A highly sensitive low-cost strain sensor was fabricated in this research study based on microdispensing direct write (MDDW) technique. MDDW is an additive manufacturing approach that involves dire...

Published
2021

30. 3D printing for soft robotics – a review

Author

Gul, Jahan Zeb, primary, Sajid, Memoon, additional, Rehman, Muhammad Muqeet, additional, Siddiqui, Ghayas Uddin, additional, Shah, Imran, additional, Kim, Kyung-Hwan, additional, Lee, Jae-Wook, additional, and Choi, Kyung Hyun, additional

Published
2018
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36. 3D printed highly flexible strain sensor based on TPU–graphene composite for feedback from high speed robotic applications.

Author

Gul, Jahan Zeb, Sajid, Memoon, and Choi, Kyung Hyun

Abstract

A novel, highly flexible and electrically resistive-type strain sensor with a special three-dimensional conductive network was 3D printed using a composite of conductive graphene pellets and flexible thermoplastic polyurethane (TPU) pellets. The morphology of the TPU graphene filament was verified using Raman spectroscopy. The composite filament was well fused and constructed an excellent three-dimensional conductive network. The size of the 3D printed strain sensor was 2 × 1.5 cm (length × width) and the layer had a depth of 200 μm. The special hierarchical conductive network endowed the 3D printed strain sensor with a desirable combination of good stretchability and a high sensitivity (gauge factor (GF) of 11 in a strain of 10% and 80 in a strain of 100% in a reversible strain regime), good durability and stability (stretch/release test of 6000 cycles) and a rapid response speed. The mechanism of evolution for the residual resistance and residual strain of the 3D printed strain sensor under cyclic loading were investigated in detail. The strain sensor was embedded inside a 3D printed Polylactic acid (PLA) based finger hinge and the bending feedback was observed. The results demonstrate that our flexible strain sensor has the potential for wide ranging applications in soft actuators, feedback from high speed robotic applications and 3D printed wearable devices. [ABSTRACT FROM AUTHOR]

Published
2019
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40. All-printed highly sensitive 2D MoS 2 based multi-reagent immunosensor for smartphone based point-of-care diagnosis.

Author

Sajid M, Osman A, Siddiqui GU, Kim HB, Kim SW, Ko JB, Lim YK, and Choi KH

Subjects
Antibodies, Immobilized metabolism, Antigens metabolism, Humans, Immunoglobulin G metabolism, Indicators and Reagents, NF-kappa B metabolism, Prostate-Specific Antigen metabolism, Reproducibility of Results, Biosensing Techniques instrumentation, Disulfides chemistry, Molybdenum chemistry, Point-of-Care Systems, Printing, Smartphone
Abstract

Immunosensors are used to detect the presence of certain bio-reagents mostly targeted at the diagnosis of a condition or a disease. Here, a general purpose electrical immunosensor has been fabricated for the quantitative detection of multiple bio-reagents through the formation of an antibody-antigen pair. The sensors were fabricated using all printing approaches. 2D transition metal dichalcogenide (TMDC) MoS 2 thin film was deposited using Electrohydrodynamic atomization (EHDA) on top of an interdigitated transducer (IDT) electrode fabricated by reverse offset printing. The sensors were then treated with three different types of antibodies that were immobilized by physisorption into the highly porous multi-layered structure of MoS 2 active layer. BSA was used as blocking agent to prevent non-specific absorption (NSA). The sensors were then employed for the targeted detection of the specific antigens including prostate specific antigen (PSA), mouse immunoglobulin-G (IgG), and nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB). IgG was then selected to test the sensors for point of care (POC) diagnosis through a specially designed electronic readout system for sensors and interfacing it with a smartphone using Bluetooth connection. The sensors showed promising performance in terms of stability, specificity, repeatability, sensitivity, limit of detection (LoD), and range of detection (RoD).

Published
2017
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