Unprecedented Piezoresistance Coefficient in Strained Silicon Carbide

Abstract

Reports reveal that the piezoresistance coefficients of silicon carbide (SiC) nanowires (NWs) are 2 to 4 times smaller than those of their corresponding bulk counterparts. It is a challenge to eliminate contamination in adhering NWs onto substrates. In this study, a new setup was developed, in which NWs were manipulated and fixed by a goat hair and conductive silver epoxy in air, respectively, in the absence of any depositions. The goat hair was not consumed during manipulation of the NWs. The process took advantage of the stiffness and tapered tip of the goat hair, which is unlike the loss issue of beam sources in depositions. With the new fixing method, in situ transmission electron microscopy (TEM) electromechanical coupling measurements were performed on pristine SiC NWs. The piezoresistance coefficient and carrier mobility of SiC NW are −94.78 × 10 −11 Pa −1 and 30.05 cm 2 V −1 s −1 , respectively, which are 82 and 527 times respectively greater than those of SiC NWs reported previously. We, for the first time, report that the piezoresistance coefficient of SiC NW is 17 times those of its bulk counterparts. These findings provide new insights to develop high performance SiC devices and to help avoid catastrophic failure when working in harsh environments.

Study on friction behavior of SiC-B4C composite ceramics after annealing

“…Monolithic B 4 C ceramics and monolithic SiC ceramics have drawn considerable attention in the industrial applications owing to their outstanding performance, including high melting point, high hardness, low density, high elastic modulus, and high chemical resistance (Li et al, 2014;Kim et al, 2014;Zhang et al, 2019a). Recently, self-healing on fractured surfaces (Zhang et al, 2018) and unprecedented piezoresistance properties of SiC (Cui et al, 2019) are discovered, which is a breakthrough and milestone contribution to design and fabricate high performance devices. In addition, a novel scratching approach was developed on a developed setup at nanoscale depth of cut and m/s, which opens a new route to investigate the tribological mechanisms of abrasive machining (Wang et al, 2018).…”

Bactericidal behavior of chemically exfoliated boron nitride nanosheets doped with zirconium

“…The use of improved procedures and enhanced slurries enables the fabrication of high-performance devices in semiconductor and microelectronics industries (Zhang et al 2017a;Qumar et al 2020;Raza et al 2019;Ikram et al 2020b). Such researches have proved to be a landmark in the contribution toward dramatically reducing pollution in industrial processes (Zhang et al 2020b;Cui et al 2019aCui et al , 2019b.…”

Dialectical Observation of Controllable Electrodeposited Ni Nanocones: the Unification of Local Disorder and Overall Order

“…Nanostructured metals with unique surfaces [1] were widely used in a variety of fields, such as surface modification [2], ultra-hydrophobic layers [3][4][5], supercapacitors [6], microelectronic interconnection [7], nanoprobes [8], solar cells [9], gas sensors [10,11], catalysts [12][13][14][15][16][17][18][19], mechanical polishing slurries [20], diamond wheels [21], nanoscale precision surfaces [22,23]. As a result, many preparation techniques of nanostructured metal surfaces had been proposed, including hydrothermal method [10,11], sol-gel method [24], template method [25], chemical vapor deposition method [26], chemical reduction method [27], and microemulsion method [28].…”