Low-operating temperature resistive nanostructured hydrogen sensors

Two-Dimensional Dy2O3-Pd-PDA/rGO Heterojunction Nanocomposite: Synergistic Effects of Hybridisation, UV Illumination and Relative Humidity on Hydrogen Gas Sensing

“…Figure 8a shows the typical p-type semiconducting sensing behaviour of the sensor as the conductivity decreases towards H 2 (reducing gas). The increase in the resistivity of the p-type sensor upon exposure to the reducing gas is due to the charge transfer from the target gas molecules to the sensing layer [1,41]. As an electron donor gas, H 2 transfers electrons to the valent band of the sensing layer, reducing the hole concentration on the surface, resulting in an increase in resistivity.…”

“…Hydrogen (H 2 ) is a non-toxic, odourless, and colourless gas that can be used as a renewable energy source [1]. H 2 is abundant on earth in different molecular forms, including water and organic chemical compounds that contain hydrogen-carbon bonds such as hydrocarbons [2].…”

Hydrogen Gas Sensing Performances of p-Type Mn3O4 Nanosystems: The Role of Built-in Mn3O4/Ag and Mn3O4/SnO2 Junctions

“…The responses towards a specific test gas are in fact required to be higher than those of other potential interferents, in order to avoid false alarms in real-time gas monitoring equipment [36,38,39]. In particular, the choice of CH 4 and CO 2 as potential interferents in real-time hydrogen leak detection is motivated by the fact that: (i) hydrogen and methane are common reducing gases, either stored, or used together [1,13]; (ii) the presence of carbon dioxide may hamper hydrogen recognition [5,21,43] in the case of fuel cells eliminating CO 2 and producing electricity and H 2 [66]. As shown in Figure S4, the present sensors yielded no responses towards CO 2 , and only weak signals upon exposure to CH 4 .…”

“…Simple architecture, cost-effective fabrication, stability under the operating conditions, and high efficiency, are the main requirements and core features of advanced sensors needed for such applications [16]. Among the various active systems and devices [20][21][22][23][24], metal oxide nanostructures have been the subject of an increasing interest, thanks to their high carrier mobility, easy fabrication and excellent stability [9,[25][26][27][28]. In particular, whereas n-type oxide semiconductors have been largely investigated as gas sensors [8,9,12,15], p-type ones have not yet been widely studied [4,17,29,30], since their responses are typically lower than those of n-type systems with comparable morphology [31][32][33].…”

Integrated co-axial electrospinning for a single-step production of 1D aligned bimetallic carbon fibers@AuNPs–PtNPs/NiNPs–PtNPs towards H2 detection

“…Hydrogen is considered as the future clean energy fuel and is widely used in numerous industries, such as, petrochemical refinery, coolant, chemical synthesis, semiconductors, fuel cells, aerospace, automobile and as energy carrier in nuclear fusion power plant. 1,2 Over the last decade, there have been growing research interests in the use of hydrogen as a zero-emission fuel in automotive applications. H2 as a fuel has already found its potential and is commercially feasible in markets comprising trucks powered by fuel cells and stationary power systems.…”