A novel wireless gas sensor based on LTCC technology

Photo-enhanced gas sensing of SnS2 with nanoscale defects

“…16,20,23,25,26 As a member of the wide class 2D materials, tin disulde (SnS 2 ) displays many intriguing properties in electronics, 27 photonics and optoelectronics, [27][28][29][30] as well as gas monitoring. 24,[31][32][33][34][35][36][37][38][39][40][41][42] It was reported recently by Kalantar-zadeh et al that a SnS 2 -based NO 2 gas sensor with a sensitivity of 0.5 ppm could be improved to 30 ppb when heated to 120 C. 24 However, an elevated operating temperature typically increases power consumption and thus a more intricate setup is required. 3,10,16,20,24,25,43 Furthermore, the high operating temperature might pose the risk of ignition when detecting in ammable or explosive atmospheres which would limit sensor's application.…”

“…31 Ahn et al built utilized vertical SnS 2 ake structures to detect NO 2 at 300 ppb, probably under its optimum conditions at 160 C. 39 Li et al heated SnS 2 their ake devices to 120 C to attain a 600 ppb detection limit. 40 Wang et al heated a SnS 2 -SnO 2 composite ake device to 80 C for a 1000 ppb detection limit. 41 While Xue et al used SnS 1.5 /Se 0.5 ake devices to detect 1000 ppb NO 2 at room temperature.…”

An LC Passive Wireless Gas Sensor Based on PANI/CNT Composite

“…After sufficient precipitation and cooling to room temperature, the supernatant was discarded and an appropriate amount of deionized water was added to the ultrasonic cleaner for 2 h. Carbon nanotubes were filtered out in a vacuum and repeatedly washed with deionized water until it became neutral. At this point, the CNTs were dried at 60 °C and we finally obtained acidified carbon nanotubes [ 24 ].…”

Magnetron Sputtered AlN Layers on LTCC Multilayer and Silicon Substrates

“…High reliability and temperature stability completed by a wide freedom in design and the possible integration of low resistivity conductor paths made of gold or silver boosts their application as radio frequency (RF) devices [18][19][20][21] and for smart system integration [22][23][24]. The composite character of the fired ceramic allows the variation of functional properties, such as permittivity, thermal expansion, or insulation resistance [25,26].…”