Table 2 Summary of sensing properties of metal-based H₂ sensors

quasi-single-crystalline Pd NWs

RT

100–10,000

10,000

8%^a

9.3//13

100

⁸⁴

Pd NSs

RT

5–10,000

10,000

0.4%^a

50/60

5

⁴⁶⁷

Pd NPs

RT

2.5–30,000

30,000

~4%^a

12/19

2.5

⁸³

half-pipe Pd NTs

RT

8000–18,000

18,000

2.1%^a

12/18

314

⁴⁶⁸

Pt NWs

RT

0.01–1,000,000

1000

14%^a

NG/NG

0.01

⁴⁶⁹

Pd NWs

RT

1000–39,000

30,000

~41.9%^a

~85.7/~296

1000

⁴⁷⁰

Pd NWs

65

1000–100,000

40,000

~5.8%^a

0.6/<2

1000

¹¹⁹

Pd NWs on Al₂O₃

RT

0.1–4%

30,000

~30%^a

56/NG

1000

¹¹⁸

suspended Pd NWs

RT

4000–20,000

20,000

4.8%^a

~350/~70

4000

⁴⁷¹

Pd hollow shells (450/10)

RT

250–25,000

10,000

60%^a

16/NG

250

⁸⁷

Pd NPs cracks on PU

RT

5–100,000

40,000

~27%^a

32.3/~38

5

⁹⁷

Pd/Cr nanogap

RT

10–40,000

10,000

50%^a

3/4.5

10

⁹⁹

Pd nanogap

RT

15,000–40,000

15,000

On/off manner

22/NG

15,000

¹⁰¹

Pd_0.6Au_0.4 nanogap (15 nm)

RT

5–100,000

10,000

~8.1%^a

11.54/9.83

5

¹⁰⁰

Pd nanogap contains Au/Cr buffer

40

20–60,000

40,000

~55%^a

60–170/30–240

20

¹⁰³

PdAu Sensor

RT

3000–30,000

30,000

NG

204/198

3000

⁴⁸

Pd@Pt@Yarn

RT

1–40,000

40,000

9.54%^a

12/48

1

⁴⁷²

Au@Pd (17/4)

RT

1000–1,000,000

10,000

>225%^a

NG/NG

1000

⁴⁷³

Pd-Sn Alloy NTs

RT

0.5–30,000

20,000

5.2%^a

20.2/17.9

0.5

¹¹¹

Pd-Ni+organosillica membranes

70°C

1–400

200

121%^a

107/NG

1

⁴⁷⁴

Ag-Pd/Cr

200

800–40,000

40,000

2.13%^a

80/170

800

⁴⁷⁵

PdMoY nanosheets

RT

1–1,000,000

10,000

18.7%^a

73/40

1

¹⁰⁴

Pd/Ni film

75

800–20,000

20,000

3.17%^a

7/6

800

⁴⁷⁶

PdNi film

RT

2–10,000

10,000

~0.7%^a

~315/~100

2

¹¹³

Pd₆₃Co₃₇ NWs

RT

1000–30,000

1000

~5-6%^a

85/200

1000

⁴⁷⁷

PdNi film

40

2–40,000

40,000

~3.3%^a

0.3/~

2

¹²⁰

PdNi film

75

5–40,000

40,000

~2.3%^a

0.4/~

5

¹²¹