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智科眼: 双语看懂新科研
纳米材料 154
Using(使用) optical() and() electrical() measurements(测量),(,) a(一个) two-dimensional(二维) anisotropic crystal(各向异性晶体) of(of) rhenium() disulfide(二硫化) was(was) found(发现) to(to) show(显示) opposite(相反) piezoresistant(压阻) effects(效应) along(along) two(两个) principle(原理) axes(),(,) i.e.(i.e.) positive() along(along) one(一个) axis() and() negative() along(along) another().(.) Piezoresistance(压电电阻) was() also() reversible(可逆);(;) it() appeared(出现) upon(upon) application() of(of) a(a) strain(应变),(,) but() the relative(相对) resistance(阻力) returned(恢复) to(to) its() original(原始) value() on(on) strain(应变) removal(消除).(.) This(这一) novel() finding(发现) is(is) expected(预计) to(to) lead to(导致) wide(广泛) application(应用) of(of) rhenium() disulfide(二硫化).(.)
Upon(Upon) application() of(of) mechanical stress(机械应力) such(这种) as(as) pressure(压力) on(on) crystals(晶体) and() some(某些) kinds(种类) of(of) ceramics(陶瓷),(,) a(a) surface charge(表面电荷) proportional(比例) to(to) the applied(施加) strain(应变) is(is) induced(引起);(;) this() phenomenon(现象) is(is) called(称为) the piezoelectric effect(压电效应).(.) The piezoelectric effect(压电效应) has(has) been(been) known() since() the mid(中期)-18th(-18th) century(世纪) and() has(has) found(发现) use(),(,) for example(例如),(,) in(in) the ignition(点火) device(装置) of(of) cigarette(香烟) lighters(打火机).(.) Today() it() is(is) widely(广泛) applied(应用) in(in) sensors(传感器),(,) actuators(执行器),(,) etc().(.) On the other hand(另一方面),(,) when(when) mechanical(机械) strain(应变) is(is) applied(应用) to(to) semiconducting materials(半导体材料),(,) some(一些) of(of) them(它们) show(显示) a(a) change(变化) in(in) electrical resistance(电阻),(,) called(称为) the piezoresistive(压阻) effect(效应).(.) Materials(材料) showing(显示) the piezoresistive(压阻) effect(效应) are(are) used(用于) in(in) pressure sensors(压力传感器),(,) strain(应变) sensors(传感器) etc().(.)
Rhenium() disulfide(二硫化) (ReS2)((ReS2)) is() a(a) two-dimensional(二维) (2-D)((2-D)) material(材料) crystallizing(结晶) into(into) a(a) flake(片状)-()like(like) structure(结构),(,) as(as) a(a) black(黑色) platelet(血小板) ((()plate()-()like(like) crystal(晶体)),(),) showing(显示) thickness(厚度)-()independent(无关) direct(直接) bandgap(带隙)*1)(*1)) and() anisotropic(各向异性) physical(物理) properties(性质).(.) It() is() classified(分类) into(into) the transition metal(过渡金属) dichalcogenides(二硫)*2)(*2)) subgroup(亚组).(.) According to(根据) theoretical calculations(理论计算),(,) it() has(具有) two(两个) anisotropic(各向异性) directions(方向) along(along) different(不同) principle(原理) axes().(.) Two(两个) anisotropic(各向异性) directions(方向) are(are) predicted(预测) to(to) respond(响应) differently(不同) to(to) a(a) uniaxial(单轴) strain(应变).(.) Upon(Upon) validation(验证) of(of) this() property(属性),(,) ReS2(ReS2) should(应该) be(be) useful(用于) in(in) the accurate(准确) detection(检测) and() recognition(识别) of(of) multidimensional(多维) strain(应变)/(/)stress(应力) and() gestures(手势),(,) which(which) will() have() wide(广泛) applications(应用) in(in) the fields(领域) of(of) electronic(电子) skin(皮肤)*3),(*3),) human()()machine() interfaces(界面),(,) strain(应变) sensors(传感器) etc().(.)
This() international(国际) research(研究) team(团队) from(from) China(中国) and() Japan(日本),(,) in(in) which(which) Dr(博士) .(.) Liu() from(from) Tianjin(天津) University(大学) and() Dr(博士) .(.) Yang() from(from) WPI-NanoLSI,(WPI-NanoLSI,) Kanazawa(金泽) University(大学),(,) played(发挥) important(重要) roles(作用),(,) not only(不仅) confirmed(证实了) the anisotropic(各向异性) piezoresistive(压阻) effect(效应) of(of) rhenium() disulfide(二硫化) but also(而且) discovered(发现) a(一种) novel() phenomenon(现象) that(that),(,) depending(根据) on(on) the direction(方向) of(of) strain(应变) applied(应用) along(along) two(两个) crystalline() axes(),(,) a(a) 2-D(2-D) device(器件) of(of) ReS2(ReS2) showed(显示出) opposite(相反),(,) i.e.(i.e.) positive() and() negative() piezoresistance(piezoresistance).(.)
A(A) 2-D(2-D) device(器件) of(of) ReS2(ReS2) was(was) fabricated(制造) as() schematically(示意) depicted(描绘) in(in) Figure() 1.(1.) After(After) examining(检查) its() configuration(配置) using(使用) atomic force(原子力) microscopy(显微镜) (AFM),((AFM),) anisotropic(各向异性) properties(特性) were(were) investigated(研究) by(通过) both(both) optical() and() electrical() methods(方法).(.)
First(首先),(,) optical measurements(光学测量) were(were) performed(进行) using(使用) reflectance(反射) difference() microscopy(显微镜)*4)(*4)) (RDM)((RDM)) developed(开发) by() the present() research(研究) team(团队).(.) A(A) device(器件) of(of) ReS2(ReS2) with(with) an(an) 8(8) nm(nm) thickness(厚度) was(was) irradiated(照射) with(with) polarized light(偏振光) from(from) various(各个) directions(方向) to(to) determine(确定) the two(两个) axial(轴向) ((()principle(原理))()) directions(方向) of(of) the 2-D(2-D) crystal(晶体) ((()Figure() 2).(2).)
Next(),(,) electric() anisotropy(各向异性) was(was) measured(测量) with(with) the same(相同) sample(样品) for(for) optical measurements(光学测量) along(along) 12(12) directions(方向) with(with) a(a) spacing(间隔) of(of) 30(30) degrees().(.) These(这些) measurements(测量) also() determined(确定) the two(两个) principle(主要) directions(方向) which(which) showed(显示) a(a) 110(110) degree() difference(差异).(.) The same(相同) measurements(测量) were(were) carried out(进行) with(with) another(另一种) device(装置) of(of) ReS2,(ReS2,) but() with(with) a(a) different(不同) thickness(厚度) (70((70) nm).(nm).) The latter(后者) also() yielded(产生) very(非常) similar(相似) anisotropic(各向异性) behavior(行为),(,) indicating(表明) the thickness(厚度)-()independent(无关) nature(性质) of(of) the phenomenon(现象).(.) These(这些) results(结果) are(are) consistent(一致) with(with) previous(以前) work(工作).(.)
The 2-D(2-D) crystal(晶体) ReS2(ReS2) device(器件) whose(谁的) principle(原理) axes() were(were) determined(确定) as() above() was(was) clamped() at(at) one(one) end() along(along) a(a) principle(原理) axis() and() the other() end() was(was) moved(移动) towards() the fixed end(定端) at(at) a(a) specified(特定) speed(速度),(,) i.e.(i.e.) a(a) compressive strain(压缩应变) was(was) applied(应用).(.) The device(装置) generated(产生) piezoresistance(压电电阻) due to(由于) the strain(应变).(.) With(With) one(one) end() fixed(固定),(,) piezoresistance(电电阻) recovered(恢复) completely(完全) when(when) the compressive strain(压缩应变) of(of) the other() end() was(was) returned(返回) to(to) its() original state(原始状态).(.)
On the other hand(另一方面),(,) when(when) the same(相同) experiment(实验) was(was) performed(进行) along(沿着) the other() principle() axis(),(,) the piezoresistance(压电电阻) due to(由于) the strain(应变) was(was) smaller(较小) when(when) a(一个) larger() strain(应变) was(was) applied(应用) and() increased(增加) when(when) the applied(应用) strain(应变) was(was) smaller(较小).(.) The same(相同) experiment(实验) was(was) repeated(重复) with(with) different(不同) ReS2(ReS2) devices(装置),(,) but() the results(结果) were(were) always(始终) consistent(一致).(.) Thus(因此),(,) ReS2(ReS2) 2-D(2-D) crystalline(晶体) devices(器件) showed(显示出) opposite(相反),(,) i.e.(i.e.) positive() or() negative() piezoresistance(压电阻) depending(取决于) on(on) the principle(原理) axes().(.)
In addition(另外),(,) when(when) the same(相同) experiment(实验) using(使用) a(a) single(单个) device(装置) was(was) repeated(重复) 28(28) times(),(,) almost(几乎) the same(相同) results(结果) were(were) obtained(获得).(.) This() indicates(表明) that() after(之后) applying(施加) a(a) strain(应变) to(to) the ReS2(ReS2) device(装置),(,) releasing(释放) the strain(应变) allowed(允许) the piezoresistant(压电) effect(效应) to(to) return(返回) to(to) its(它的) original state(原始状态).(.)
While(虽然) the piezoresistant() effect(效应) is() a(a) result(结果) of(of) the bandgap(带隙) adjustment(调节) induced(引起) by() a(a) strain(应变),(,) the piezoelectric effect(压电效应) is() a(a) result(结果) of(of) a(a) strain(应变)-()dependent(依赖性) distortion(变形) of(of) the crystal lattice(晶格).(.) Various(各种) electrical measurements(电测量) were() performed(进行),(,) which(which) also() demonstrated(表明) that(that) the phenomenon(现象) observed(观察) was() piezoresistance() and() not() the piezoelectric effect(压电效应).(.)
The present() study(研究) demonstrated(表明) that(that) the ReS2(ReS2) 2-D(2-D) devices(装置) showed(显示出) opposite(相反),(,) i.e.(i.e.) positive() and() negative() piezoresistance(压电阻) depending(取决于) on(on) the principle(原理) axes() along(along) which(which) a(a) strain(应变) was(was) applied(应用).(.) Such(这种) positive() and() negative() piezoresistant(压电) effects(效应) depending(取决于) on(on) the principle(原理) axes() were(were) not() observed(观察) in(in) previous(先前) studies(研究).(.) Thus(因此),(,) the present() study(研究) is(is) the first(首次) to(to) identify(确定) such(这种) an(an) effect(效应).(.) It() is(is) expected(预计) that(that) this(这项) study(研究) will() lead to(导致) wide(广泛) applications(应用) of(of) ReS2(ReS2) to(to) electronics(电子产品),(,) such(such) as() electronic(电子) skin(皮肤),(,) human()-()machine() interfaces(界面),(,) strain(应变) sensors(传感器) and() so(so) on.(on.)

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