Daily writing carbon ink: Novel application on humidity sensor with wide detection range, low detection limit and high detection resolution

Enhanced Blocking Effect: A New Strategy to Improve the NO2 Sensing Performance of Ti3C2Tx by γ-Poly(l-glutamic acid) Modification

“…Especially, to achieve as stable a state as possible, the response/recovery period of Ti 3 C 2 T x is 1500/1500 s. Figure a shows the dynamic response–recovery curve of pristine Ti 3 C 2 T x ; the resistance increases with the increase of the NO 2 concentration, and it shows a response of 13.2% to 50 ppm NO 2 with the response (recovery) time of ∼18.5 min (18.3 min). As shown in Figure a, it is difficult for gas molecules to desorb from Ti 3 C 2 T x , resulting in a serious baseline drift (i.e., a lack of complete recovery when the gas is turned off) at room temperature . The Ti 3 C 2 T x -based sensor’s baseline resistance changes by 30.7% (from 605.1 to 790.9 Ω) after a 2–50 ppm NO 2 response.…”

“…The gas sensing performances of the as-developed sensors were measured at room temperature with 50% RH, and the dynamic homemade system with the device analyzer (AES-4SD, Beijing Sinoage Tech Co., Ltd., China) was constructed according to our previous studies. , As shown in Figure S2, different gas concentrations (2–50 ppm) were obtained by adjusting the mass flow ratio of dry air (simulated air gas, N 2 : 79%, O 2 : 21%, purity: 99.99%), humid air, and target gases (100 ppm NO 2 /NH 3 /H 2 S/SO 2 /CH 4 , 1% CO 2 ; dry air was used as the balanced gas; Sichuan Zhongce Standard Technology Co., Ltd., China). As shown in Table S1, the total gas flow rate (200 standard cubic centimeters per minute (sccm)) of three channels was precisely controlled by three mass flow controllers (MFCs).…”

“…As shown in Figure 4a, it is difficult for gas molecules to desorb from Ti 3 C 2 T x , resulting in a serious baseline drift (i.e., a lack of complete recovery when the gas is turned off) at room temperature. 38 The Ti 3 C 2 T x -based sensor's baseline resistance changes by 30.7% (from 605.1 to 790.9 Ω) after a 2−50 ppm NO 2 response. Figure 4b displays the repeatability curve of Ti 3 C 2 T x to 50 ppm NO 2 for six cycles.…”

All-cellulose-derived humidity sensor prepared via direct laser writing of conductive and moisture-stable electrodes on TEMPO-oxidized cellulose paper

“…[13][14][15][16] In addition, the high density of hydrophilic groups in cellulose molecules makes them sensitive to water vapor, thus providing the ability to use cellulose as a humidity-sensing material. 11,[17][18][19][20] Various electrodes have been fabricated on cellulosic materials using different methods, 21 such as printing, 11 pasting, 20 painting, 22,23 and spraying, 24 for flexible and wearable humidity sensing. For example, a flexible humidity sensor comprising a 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-oxidized cellulose nanofiber as the sensing material and gold as the electrodes has been reported.…”

Paper and Salt: Biodegradable NaCl-Based Humidity Sensors for Sustainable Electronics

“…The range of possible materials to be employed for humidity sensing purposes spans from ceramics, such as Al 2 O 3 (Chakraborty et al, 1999), TiO 2 (Morimoto et al, 1969;McCafferty and Zettlemoyer, 1971), SiO 2 (Lin et al, 1993;D'apuzzo et al, 2000;Kong et al, 1997), and spinel compounds, to modified polyelectrolytes (Rauen et al, 1993;Sakai et al, 1995;Gong et al, 2002a;Gong et al, 2002b;Lee et al, 2013) and conductive polymers (Macdiarmid, 1987). In addition, humidity sensors based on carbon materials such as carbon nanotubes (Han et al, 2012;Zhu et al, 2019), carbon ink (Duan et al, 2021), and graphene (Burman et al, 2016;Hassan et al, 2018;Park et al, 2018;Wan et al, 2018) have been previously reported in literature. A 2D rGO:MoS 2 based humidity sensor with a sensitivity of 0.973 in the range from 30-80% RH is reported (Adib et al, 2021).…”