Hanyang University · Engineering
Professor Mahesh Kumar's research lab specializes in the design and development of advanced nanomaterials for next-generation gas sensing applications. The lab focuses on metal oxide semiconductors, transition metal dichalcogenides like MoS₂, and hybrid nanostructures such as ZnO-rGO and MoS₂-MoO₃ for highly sensitive, selective, and low-power gas sensors operating at room or low temperatures. Key research directions include nanostructure synthesis, heterojunction engineering, and interface modulation to enhance sensing performance for environmental monitoring, industrial safety, and wearable health devices.
Figures are computed from collected data and may differ slightly.
Metal oxide semiconductors-based gas sensors have been extensively explored due to their high sensing response, cost-effectivity, long-term stability, and simple fabrication. However, their utilization at low operating temperature is still challenging. Thus, reduction in power consumption is highly essential for long-term usage of gas sensors. ZnO nanostructures-based gas sensors are one of the most eligible candidates where a real-time detection of explosive and toxic gases is needed. On this s
Abstract In gas sensor technology, current research efforts are focused on developing a high performance miniaturized gas sensor operating at room temperature. In recent years, layered semiconducting material MoS 2 has gained vast attention in sensing field owing to the detection of a variety of analytes at room temperature, high surface‐to‐volume ratio, and also provided substantial advantages in emerging flexible and wearable sensing field. Herein, a state‐of‐art overview of the utilization of
Abstract The usage of the gas sensor has been increasing very rapidly in the industry and in daily life for various potential applications. In the recent years, metal oxide semiconductors (MOS) become the primary choice for designing highly sensitive, stable, and low‐cost real‐life applications‐based gas sensors due to their inherent physical and chemical properties. Researchers have proposed numerous sensing mechanisms to explain the functionality of MOS‐based gas sensors. In this review, we ha
We report enhanced hydrogen-gas-sensing performance of a Ni-doped ZnO sensor decorated with the optimum concentration of reduced graphene oxide (rGO). Ni-doped ZnO nanoplates were grown by radio frequency sputtering, rGO was synthesized by Hummer's method and decorated by the drop cast method of various concentration of rGO (0-1.5 wt %). The current-voltage characteristics of the rGO-loaded sensor are highly influenced by the loading concentration of rGO, where current conduction decreases and s
We report highly hydrogen selective Pd contacted ZnO nanorods based sensor detecting low concentration even at low operating temperature of 50 °C. The sensor performance was investigated for various gases such as H<sub>2</sub>, CH<sub>4</sub>, H<sub>2</sub>S and CO<sub>2</sub> at different operating temperatures from 50 °C to 175 °C for various gas concentrations ranging from 7 ppm to 10,000 ppm (1%). The sensor is highly efficient as it detects hydrogen even at low concentration of ~7 ppm and a
Abstract A nucleation controlled one‐step process to synthesize MoS 2 –MoO 3 hybrid microflowers using vapor transport process and its application in efficient NO 2 sensing at room temperature are reported. The morphology and crystal structure of the microflowers are characterized by scanning electron microscope (SEM), Raman, X‐ray diffraction (XRD), and X‐ray photoelectron spectroscopy techniques. A cathodoluminence mapping reveals that the core of the microflower consists of MoO 3 , and the fl
We demonstrate a highly selective and reversible NO<sub>2</sub> resistive gas sensor using vertically aligned MoS<sub>2</sub> (VA-MoS<sub>2</sub>) flake networks. We synthesized horizontally and vertically aligned MoS<sub>2</sub> flakes on SiO<sub>2</sub>/Si substrate using a kinetically controlled rapid growth CVD process. Uniformly interconnected MoS<sub>2</sub> flakes and their orientation were confirmed by scanning electron microscopy, x-ray diffraction, Raman spectroscopy and x-ray photoele
This review analytically summarises the state-of-art advances in hBN based devices with a particular emphasis on gas sensors. The involved physics and sensing mechanism for detecting different gas molecules are also thoroughly elucidated.
Flexible/wearable gas sensor technology is gaining huge interest in the current era of the Internet of Things for its applications in personal environmental monitoring, healthcare, and safety.
The drug release rate controlling behavior, higher drug loading, immuno-neutrality, substantial biocompatibility, capability to bypass mononuclear phagocytic system, long circulating nature and tissue extraction by virtue of enhanced permeability and retention effect are the major promises of these nanocarriers. On the other hand, the concerns like elimination from the biological system, anticipated tissue toxicity, stability of the final product, sterility issues and commercial viability pose c
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