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Open research questions in Gas Sensing Nanomaterials and Sensors

120 gap statements mined from Gas Sensing Nanomaterials and Sensors papers in our 4.5M-paper local library, which holds 3,610 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The paper identifies the need for high-performance hydrogen sensors with improved sensitivity, selectivity, and durability. It highlights the potential of MOF-derived nanostructures in practical sensing technologies.

    Ultrasonic-Assisted Synthesis of Layered Core–Shell Ni-MOF Derivatives for Enhanced Hydrogen Sensing · 2026 · DOI

  • Further studies could investigate the effect of different halogen substituents on the sensor response. The development of sensors with even lower limits of detection could be a direction for future research.

    Modification of Single-Walled Carbon Nanotubes with Halogen-Substituted Metal Phthalocyanines for Chemiresistive Ammonia Detection · 2026 · DOI

  • The study also highlights the challenges associated with the bundling of single-walled carbon nanotubes, which severely limits their application as sensing layers.

    Modification of Single-Walled Carbon Nanotubes with Halogen-Substituted Metal Phthalocyanines for Chemiresistive Ammonia Detection · 2026 · DOI

  • Existing H2S sensors may not provide rapid low-ppm detection. There is a need for highly sensitive and reproducible H2S sensors. The development of new materials and technologies for H2S sensing is necessary.

    Comparative Gas-Sensing Studies of EPAA with Aniline Tetramer in the Main/Side Chain and Corresponding Densely/Porous Electro-Spun Films · 2026 · DOI

  • The lack of selectivity in SMOs. The need for high working temperatures in SMO devices. The gap in developing unified economical and environmentally friendly solutions for gas sensors.

    Intertwining Density Functional Theory and Experiments in the Investigation of Gas Sensing Mechanisms: A Review · 2025 · DOI

  • The sensor needs to achieve rapid and accurate detection of hydrogen leakage at room temperature. The sensor needs to have high sensitivity and selectivity for hydrogen detection. The sensor needs to be able to detect hydrogen leakage in a range of concentrations up to 20%.

    Electrochemical Sensor for Hydrogen Leakage Detection at Room Temperature · 2025 · DOI

  • There is a need for rapid and accurate detection of hydrogen leakage to ensure its safe usage. Existing methods may not be sufficient for efficient and safe hydrogen leakage detection.

    Electrochemical Sensor for Hydrogen Leakage Detection at Room Temperature · 2025 · DOI

  • The lack of reliable and real-time monitoring technology for environmental pollution. The limitations of traditional sensing materials, including cross-sensitivity and high power requirements. The need for scalable, reproducible, and stable MOF-based sensors.

    Advanced Metal–Organic Framework-Based Sensor Systems for Gas and Environmental Monitoring: From Material Design to Embedded Applications · 2025 · DOI

  • The need for advanced, reliable instrumentation for accurate detection of relative humidity. The lack of a sustainable flexible humidity sensor with rapid response and recovery times, long-term stability, and high precision.

    Development of a Sustainable Flexible Humidity Sensor Based on Tenebrio molitor Larvae Biomass-Derived Chitosan · 2025 · DOI

  • Traditional gas sensors often lack high sensitivity and selectivity. Two-dimensional materials have not been fully explored for gas sensor applications. The interaction mechanisms between gas molecules and CuO-SnS monolayers are not well understood.

    Adsorption and Detection of Toxic Gases on CuO-Modified SnS Monolayers: A DFT Study · 2025 · DOI

  • Limited understanding of the activation mechanism of PANI for H2S detection.

    Flexible Gas Sensor Based on PANI/WO3/CuO for Room-Temperature Detection of H2S · 2025 · DOI

  • The need for flexible and wearable gas sensors with real-time monitoring capabilities. The lack of comprehensive assessments of recent advancements in intelligent gas sensing technologies.

    Intelligent Gas Sensors: From Mechanism to Applications · 2025 · DOI

  • Titanium‐oxo clusters (TOCs), molecular analogs of TiO 2, have shown promise in various applications but remain underexplored in practical applications of gas sensors.

    Chemiresistive triethylamine detection based on novel titanium‐oxo clusters gas sensor and practical application in food spoilage monitoring · 2025 · DOI

  • Improving the gas selectivity of the sensor when the hydrogen concentration is below 1%. Reducing the interference of other gas molecules on the performance of hydrogen sensors.

    Hydrogen Sensors Based on Pd-Based Materials: A Review · 2025 · DOI

  • The development of novel humidity sensors with high sensitivity, accuracy, and stability is crucial. Classic electrical humidity sensors remain the most widely used, despite the development of several novel humidity sensors.

    Humidity-Sensing Performance of TiO2/RGO and α-Fe2O3/RGO Composites · 2025 · DOI

  • The development of strategies to address the limited exploration of bimetallic/multimetallic synergistic effects in gas sensing.

    Noble Metal Functionalized Metal Oxide Semiconductors for Enhanced Gas Sensing · 2025 · DOI

  • Qualitative and quantitative analysis confirms the formation of ZnSnO 3 and Zn 2 SnO 4 phases, along with additional Zn─Sn─O matrix compounds whose precise identification remains inconclusive.

    Ultrasonic Spray Pyrolysis of Functional Zn─Sn─O Matrix Semiconductors: Stoichiometric Design for Enhanced Acetone Selectivity in VOC Sensing · 2025 · DOI

  • Investigate the effect of different precursor compositions on sensor performance - Explore the use of Ni-Layer-Pyrolysis in other gas sensing…

    Ultrasonic-Assisted Synthesis of Layered Core–Shell Ni-MOF Derivatives for Enhanced Hydrogen Sensing · 2026 · DOI

  • The study did not investigate selectivity toward other gases - Only one type of sensor material (p-GaAs) was used - The sample size is not explicitly stated, but the range of porosity tested is limited…

    Effect of Porosity on the Impedance Response of Porous GaAs-Based NO2 Gas Sensors · 2026 · DOI

  • Investigate the effect of different gas mixtures on the sensors - Explore other semiconductor materials for NO2 sensing applications - Conduct a more extensive study with a larger number of samples and varying…

    Effect of Porosity on the Impedance Response of Porous GaAs-Based NO2 Gas Sensors · 2026 · DOI

  • Limited by the lack of integrated testing platforms, - Pristine graphene typically exhibits limited selectivity and relatively weak interactions with gas…

    Integrated Approaches for Development of Gas Sensors: From Nanomaterials and Simulated Environment to Application in Smart Cities · 2026 · DOI

  • Development of gas sensors suitable for integration into the smart monitoring system, - Employment of optimal solutions in sMSs at the points…

    Integrated Approaches for Development of Gas Sensors: From Nanomaterials and Simulated Environment to Application in Smart Cities · 2026 · DOI

  • The analysis did not consider noise to avoid a statistical analysis given the random nature of noise, - The device was simulated using the PROTEUS software, - The experimental work consists of three sections but the details…

    Design, Simulation, and Manufacture of a Detector for High Concentrations of C3H8 Gas Based on the Electrical Response of the CoSb2O6 Oxide: A Prospectus for Industrial Safety · 2026 · DOI

  • Selecting a response time other than 2 s for the operation of the device, - Developing gas sensors based on semiconductors type n and type p for safety systems where combustion…

    Design, Simulation, and Manufacture of a Detector for High Concentrations of C3H8 Gas Based on the Electrical Response of the CoSb2O6 Oxide: A Prospectus for Industrial Safety · 2026 · DOI

  • Further analysis of the interaction mechanisms between CuO-SnS monolayers and toxic gases - Investigation of the effects of different modifying sites on the adsorption properties of CuO-SnS monolayers - Experimental verification of the theoretical…

    Adsorption and Detection of Toxic Gases on CuO-Modified SnS Monolayers: A DFT Study · 2025 · DOI

Most-cited papers in Gas Sensing Nanomaterials and Sensors

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Open questions raised by papers listed on this page include: (1) Further studies could investigate the effect of different halogen substituents on the sensor response (“Modification of Single-Walled Carbon Nanotubes with Halogen-Substituted Metal…”, 2026); (2) There is a need for highly sensitive and reproducible H2S sensors (“Comparative Gas-Sensing Studies of EPAA with Aniline Tetramer in the Main/Side…”, 2026); (3) There is a need for rapid and accurate detection of hydrogen leakage to ensure its safe usage (“Electrochemical Sensor for Hydrogen Leakage Detection at Room Temperature”, 2025); (4) The lack of reliable and real-time monitoring technology for environmental pollution (“Advanced Metal–Organic Framework-Based Sensor Systems for Gas and Environmental…”, 2025); (5) The lack of a sustainable flexible humidity sensor with rapid response and recovery times, long-term stability, and high precision (“Development of a Sustainable Flexible Humidity Sensor Based on Tenebrio molitor…”, 2025). 120 gap statements have been mined from Gas Sensing Nanomaterials and Sensors papers in our 4.5M-paper local library, which holds 3,610 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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